搜档网
当前位置:搜档网 › 《新编实用英语综合教程》A卷

《新编实用英语综合教程》A卷

《新编实用英语综合教程》A卷
《新编实用英语综合教程》A卷

一、单项选择:请选择最符合题意的选项,并将其代表字母填在答题纸相应的题目序号后的空格处,评分以答题纸上的答案为准。本大题共15小题,每小题1分,满分15分,错选、多选、漏选都不得分。

1.take part in ________

A、folder

B、diet

C、offensive

D、participate

2. for two persons

A、refresh

B、double

C、aisle

D、professional

3. a passageway between rows of seats _________

A、double

B、aisle

C、professional

D、lean

4. holder for loose paper ________

A、schedule

B、diet

C、folder

D、offensive

5. to bent slightly __________

A、double

B、lean

C、professional

D、aisle

6. No sooner had I entered the room than the telephone ________ .

A. rang

B. rings

C. had rung

D. was ringing

7. The bed is by far ______ than the previous one.

A. comfortable

B. comfortabler

C. most comfortable

D. more comfortable

8. She can’t see to he lp _________ , and no one else can help her either.

A. hers

B. her

C. herself

D. she

9. The question is too difficult, and everyone is _________ .

A. at one’s wits end

B. at his wits’end

C. in his wits end

D. out of his wits end

10. She screamed and jumped up, very much by a bug.

A. shocking

B. having shocked

C. was shocking

D. shocked

11.By the side of the new teaching hall _________, built in the 1930s.

A.there stands a library

B. stands a library

C. a library stands

D. does a library stand

12. Self-confidence_________by repeated failures.

A. fortified

B. undermined

C. strengthened

D. wore

13. With both sides so determined to get what they want, there seems to be no room for _________.

A. adjust

B. compromise

C. settlement

D. yield

14. Analysts are often under the_________that the country performs quite well economically, but, as a matter of fact, it is standing on the verge of a financial crisis.

A. conception

B. illusion

C. disillusion

D. decept

15. Their marriage came to an end because they were simply not_________with each other.

A. harmony

B. compatible

C. incompatible

D. compromise

二、阅读理解:请阅读以下四篇文章,并根据文章内容回答问题并选出最符合题意的选项,并将其代表字母填在答题纸相应的题目序号后的空格处,评分以答题纸上的答案为准。本大题共20小题,每小题2分,满分40分,错选、多选、漏选都不得分。

[Paragraph One] Miss. Gogers taught physics in a New York school. Last month she explained to one of her classes about sound, and she decided to test them to see how successful she had been in her explanation. She said to them, “Now I have a brother in Los Angeles. If I was calling him on the phone and at the same time you were 75 feet away, listening to me from across the street, which of yo u would hear what I said earlier, my brother or you and for what reason?” Tom at once answered, “Your brother. Because electricity travels faster than sound waves.” “That’s very good,” Miss. Gogers answered, but then one of the girls raised her hand, and M iss. Gogers said,“Yes, Kate.” “I disagree,” Kate said, “Your brother would hear you earlier because when it’s 11 o’clock here it’s only 8 o’clock in Los Angeles.”

16. Miss. Gogers was teaching her class_________.

A. how to telephone

B. about electricity

C. about time zone

D. about sound

17. Miss. Gogers raised this question because she wanted to know whether______.

A. it was easy to phone to Los Angeles

B. her student could hear her from 75 feet away

C. her students had grasped her lesson

D. sound waves were slower than electricity

18. Tom thought that electricity was _________.

A. slower than sound waves

B. faster than sound waves

C. not so fast as sound waves

D. as fast as sound waves

19. Kate thought Tom was wrong because _______.

A. clocks in Los Angeles showed a different time from those in New York

B. electricity was slower than sound waves

C. Tom was not good at physics at all

D. Tom’s answer had nothing to do with sound waves

20. Whose answer do you think is correct according to the law of physics?

A. Tom’s

B. Kate’s

C. Bath A and B

D. Neither A nor B

[Paragraph Two] In 1939 two brothers, Mac and Dick McDonald, started a drive-in restaurant in San Bernadino, California. They carefully chose a busy corner for their location. They had run their own businesses for years, first a theater, then a barbecue(烤肉)restaurant, then another drive-in. But in their new operation, they offered a new, shortened menu: French fries, hamburgers, and sodas. To this small selection they added one new concept: quick service, no waiters or waitresses, and no tips.

Their hamburgers sold for fifteen cents. Cheese was another four cents. Their French fries and hamburgers had a remarkable uniformity, for the brothers had developed a strict routine for the preparation of their food, and they insisted on their cooks’ sticking to their routine. Their new drive-in became incredibly popular, particularly for lunch. People drove up by the hundreds during the busy noontime. The self-service restaurant was so popular that the brothers had allowed ten copies of their restaurant to be opened. They were content with this modest success until they met Ray Kroc.

Kroc was a salesman who met the McDonald brothers in 1954, when he was selling milkshake-mixing machines. He quickly saw the unique appeal of the brothers’ fast-food restaurants and bought the right to franchise(特许经营)other copies of their restaurants. The agreement struck included the right to duplicate the menu. The equipment, even their red and white buildings with the golden arches(拱门).

Today McDonald’s is really a household name. Its names for its sandwiches have come to mean hamburger in the decades since the day Ray Kroc watched people rush up to order fifteen-cent hamburgers. In 1976, McDonald’s had over $ 1 billion in total sales. Its first twenty-two years is one of the most incredible success stories in modern American business history.

21. This passage mainly talks about.

A. the development of fast food services

B. how McDonald’s became a billion-dollar business

C. the business careers of Mac and Dick McDonald

D. Ray Kroc’s business talent

22. Mac and Dick managed all of the following businesses except.

A. a drive-in

B. a theater

C. a cinema

D. a barbecue restaurant

23. We may infer from this passage that.

A. Mac and Dick McDonald never became wealthy for they sold their idea to Kroc

B. The location the McDonalds chose was the only source of the great popularity of their drive-in

C. Forty years ago there were numerous fast-food restaurants

D. Ray Kroc was a good businessman

24. The passage suggests that

A. creativity is an important element of business success

B. Ray Kroc was the close partner of the McDonald brothers

C. Mac and Dick McDonald became broken after they sold their ideas to Ray Kroc

D. California is the best place to go into business

25. As used in the second sentence of the third paragraph, the word “unique” means.

A. special C. financial

B. attractive D. peculiar

[Paragraph Three] I don’t think there is anything wrong with your blood. The key to your problem is that long nap (打盹,小睡) after dinner.

If you didn’t sleep for hours during the early part of the evening, you would be more ready to

sleep at bedtime. If you didn’t nap after dinner, you would not want to stay up so late, and you would not feel the need to take a sleeping pill. The pill is still working in your system when you get up in the morning. This helps account for the fact that you feel tired all day.

You should get out of the habit of sleeping during the evening. Right after your evening meal, engage in some sort of physical activity --- a sport such as bowling, perhaps. Or get together with friends for an evening of cards and conversation. Then go to bed at your usual time or a little earlier, and you should be able to get a good night's rest without taking a pill.

If you can get into the habit of spending your evenings this way, I am sure you will feel less tired during the day. At first it may be hard for you to go to sleep without taking a pill. If so, get up and watch television or do some jobs around your house until you feel sleepy. If you fall asleep and then wake up a few hours later, get up but do not take a sleeping pill. Read a while or listen to the radio, and make yourself a few hours’ sleep that night, you will feel better in the morning than you usually feel after taking a pill. The next night you will be ready to sleep at an earlier hour.

The most important thing is to avoid taking that nap right after dinner and avoid taking pills.

26. According to the writer, it is difficult for you to go to sleep because .

A. you get the habit of staying up later

B. you haven’t taken sleeping pills

C. you sleep for hours after dinner

D. you fail to do some exercises

27. Which of the following is NOT true if you want to get out of the habit of sleeping during the evening?

A. Go to bed earlier than usual.

B. Talk with friends after dinner.

C. Stay with friends after dinner.

D. Do some physical labor.

28. You feel tired all day probably because.

A. you stay up too late

B. you get up too early in the morning

C. you take sleeping pills

D. you wake up too frequently at night

29. Which of the following is true according to the passage?

A. You mustn’t take sleeping pills in order to get a good night’s sleep.

B. You should stay up if you want to sleep effectively.

C. Food is necessary at night if you fail to go to sleep.

D. It is very important to get out of the habit of taking a nap after dinner.

30. We may infer that the author is most probably a.

A. doctor

B. scientist

C. reporter

D. professor

[Paragraph Four] It was Monday. Mrs. Smith’s dog was hungry, but there was not any meat in the house. Considering that there was no better way. Mrs. Smith took a piece of paper, and wrote the following words on it: “Give my dog half a pound of meat.” Then she gave the paper to her dog and said gently: “Take this to the butcher (*person whose job is selling meat), and he’s going to give you your lunch today.” Holding the piece of paper in its mouth, the dog ran to the

butcher. It gave the paper to the butcher. The butcher read it carefully, recognized that it was really the lady’s handwriting and soon did it as he was asked to. The dog was very happy, and ate the meat up at once. At noon, the dog came to the shop again. It gave the butcher a piece of paper again. After reading it, he gave it half a pound of meat once more. The next day, the dog came again exactly at noon. And as usual, it brought a piece of paper in the mouth. This time, the butcher did not take a look at paper, and gave the dog its meat, for he had regarded the dog as one of his customers. But, the dog came again at four o’clock. And the same thing happened once again. To the butcher’s more surprise, it came for the third time at six o’clock, and brought with it a third piece of paper. The butcher felt a bit puzzled. He said to himself, “This is a small dog. Why does Mrs. Smith give it so much meat to eat today?” Looking at the piece of paper, he found that there were not any words on it!

31.Mrs Smith treated her little dog quite_________.

A. cruelly

B. fairly

C. kindly

D. friendly

32. It seemed that the dog knew well that the paper Mrs. Smith gave it_______.

A. might do it much harm

B. could do it much good

C. would help the butcher

D. was worth many pounds

33.The butcher did not give any meat to the dog __________.

A. before he felt sure that the words were really written by Mrs. Smith

B. when he found that the words on the paper were not clear

C. because he had sold out all the meat in his shop

D. until he was paid enough by Mrs. Smith

34.From its experience, the dog found that ________.

A. only the paper with Mrs. Smith’s words in it could bring it meat

B. the butcher would give the meat to it whenever he saw it

C. Mrs. Smith would pay for the meat it got from the butcher

D. a piece of paper could bring it half a pound of meat

35.At the end of the story, you’ll find that _______.

A. the dog was clever enough to write on the paper

B. the dog dared not go to the butcher’s any more

C. the butcher was told not to give any meat to the dog

D. the butcher found himself cheated by the clever animal

三、完型填空:请根据上下文的意思,在四个选项中选出最适合的单词填入文章空格处,并将其代表字母填在答题纸相应的题目序号后的空格处,评分以答题纸上的答案为准。本大题共10小题,每小题1分,满分10分,错选、多选、漏选都不得分。

During two years living together, a young couple experienced the usual ups and downs 36 they grew to know, understand, and respect each other. They 37 confronted the

weaknesses and 38 of each other’s characters. Form their racial and cultural differences they learned 39 about tolerance, compromise and honesty.

The woman’s parents’ bitter, painful divorce after 35 years of marriage emphasized the fact that many couples marry 40 the wrong reasons: they are incompatible, they take time to know each other. They overlook serious personality 41 and expect marriage is an automatic way to make everything work out right.

When the daughter mentioned wedding plans to her family, her mother counseled her to be 42 sure she was doing the right thing. When her father learned of the boyfriend’s problems with the Citizenship department, he immediately suspected this black man wanted to marry his daughter 43 to remain in the United States.

Wanting to persuade the daughter to put off the marriage until later, the father quoted statistics showing mixed couples had higher divorce rates 44 same race couples having marital difficulties. He told his daughter 45 realistic because people can be very cruel toward children from mixed marriages.

36. A. though B. because C. as D. since

37. A. honestly B. honesty C. honest D. honey

38. A. strengthen B. strengthened C. strengths D. strength

39. A. considerably B. convenience C. contemporarily D. consider

40. A. in B. for C. about D. at

41. A. conflicts B. confuses C. confronts D. confides

42. A. ready B. really C. reality D. readily

43. A. just B. as C. because D. order

44. A. that B. then C. than D. those

45. A. to be B. be C. being D. to being

四、翻译(共20分)

A.英译汉(每题2分,共10分。)

46.The course of true love never did run smooth.

47.Since we generally assess and probe professionally rather than socially ,we start talking business very quickly.

48.He once majored in economics and accounting at college.

49.Life is full of ups and downs.

50.The working staff had some reservations about the truth of the claim.

B.汉译英(每题2分,共10分。)

51.如今,人们越来越多地依赖计算机来解决各种各样的问题。

52.他把所有空余时间都花在学习上,以弥补失去了的时间。

53.自今年夏初起,海尔公司(Haier)展开了空调促销的广告大战。

54.政府已采取了一系列新的环保措施。

55.玛丽的父母不同意她去美国,因此他最终能否实现自己的愿望尚不可知。

五、作文:请根据给定的题目,用英文写出一篇100个单词左右的文章,要求:1、内容紧扣题目;2、单词、语法基本准确,语意连贯。(满分15分)

My View on teacher

中国矿业大学采矿学试题(A)

采矿学试题(A) 考生姓名学号: 成绩(分) 一、简答题(5×6=30分) 1、井田是如何划分为采煤工作面的? 2、何谓井田开拓方式?按井筒(硐)形式,井田开拓方式分为几类?主井开 拓方式的适用条件? 3、何谓准备方式?按煤层存条件的准备方式有几类?各适用于什么条件? 4、何谓采煤方法?按采煤工作面布置及推进方向的不同。长壁体系采煤方法 分为几类?长壁体系采煤法基本特点? 5、何谓矿井开采水平垂高?并说明开采水平垂高与阶段重高的关系? 6、根据技术因素如何确定采区走向长度? 二、填空题(2×15=30分) 1、根据当前开采技术条件,我国将煤层按倾角分为: ;; ;; 2、能源是; 标准煤是; 能源折算系数是。 3、根据勘探和地质研究程度,将煤炭储量按精度分级有; ;;。其中和为储量;和和

为储量;级为储量。 4、煤田是。 井田是。 5、阶段是。 开采水平是。 辅助水平是。 6、上山是。 采区上山是。 主要上山是。 7、立井的开拓方式是。 斜井开拓开方式是 平硐开拓方式是。 8、综合工作面及时支护方式是。 它的适有条件是。 综采工作面滞后支护方式是。 它的适用条件是。 9、普采工作面、采煤工作空间一般分为、、。 普采工作面的采煤循环是以。 为标志完成一个采煤循环。 10、矿井生产能力是。 矿井井型是。 矿井核定生产能力是。 11、矿井用长壁体系开采多个煤层,煤层间的开采顺序有; 采区的开采顺序有。 回采工作面的回采顺序有。 12、布置采区上部车场的关健问题是;采 区中部车场解决的关健问题是;采区

下部车场解决的关健问题是。 13、DK615—4—12中,“DK”代表,“6”代表, “15”代表,“4”代表,“12”代表。该型号表示向道岔。 14、采区采出率是。 开拓掘进率是。 生产矿井的全部掘进率是。 15、按其作用和服务范围,矿井井巷可分为巷道,巷道, 巷道。 三、论述题(2×10分) 1、试述高瓦斯矿井综采工作面区段平巷布置的特点。 2、试述多井筒分区域开拓方式的特点及适用性。 四、阅图及综合题(20分)如图1所示,试说明: 1、井巷名称: 2、写出运煤、通风及运料的生产系统; 3、准备方式的类型; 4、如采煤工作面发生突水,试选择避灾路线。(图1)

《机械制造基础》期末考试试卷附答案

《机械制造基础》期末考试试卷附答案 一.填空题(每空2分 共40分) 1.合金结晶的基本规律,即在过冷的情况下通过 与 来完成。 2.钢的冷处理可以促使残余奥氏体继续转变为 ,提高零件的尺寸稳定性。 3.牌号ZG200-400中,字母“ZG ”表示 ,数字“400”表示 。 4.焊条由 和 两部分组成。 5.一般机械零件常见的失效形式有 、 、 三种形式。 6.基本偏差一般为 。 7.定向公差有 、 、 三个项目。 8.切削合力可分解为 、 和 三个分力。 9.卧式普通车床结构主要分为三箱一体,三箱是 、 、 。 二.选择题(每题3分 共30分) 1.表示金属材料屈服强度的符号是( ) A. s σ B. b σ C. 1σ- 2.高碳钢最佳切削性能的热处理方法是( ) A.完全退火 B.正火 C.球化退火 3.45钢属于( ) A.工具钢 B.结构钢 C.铸钢 4.下列材料中,焊接性能最差的是( ) A.低碳钢 B.高碳钢 C.铸钢 5.决定配合公差带大小和位置的是( ) A.标准公差 B.基本偏差 C.配合公差 6.下图所示游标卡尺的读数是( ) A.1.25 B.10.5 C.10.25 7.属于形状公差的是( ) A.平面度 B.平行度 C.同轴度 8.影响刀头强度和切削流出方向的刀具角度是( ) A.主偏角 B.前角 C.刃倾角

9.四爪卡盘的四个爪的运动是( ) A.同步 B.连续 C.独立 10.为减小工件已加工表面的粗糙度,在刀具方面常采取的措施是( ) A.减小前角 B.增大主偏角 C.减小后角 三.判断题(对的打√,错的打×。每题2分共20分) 1.金属材料在拉伸试验中都经历弹性变形、屈服、冷变形强化、缩颈与断裂四个变形阶段( ) 2.钢的淬透性取决于其临界冷却速度,临界冷却速度越小,淬透性越好( ) 3.碳钢中只有铁、碳两种元素( ) 4.铸件在凝固和冷却过程中,固态收缩只引起铸件外部尺寸的改变( ) 5.一般来说,若材料的强度极限高,则疲劳强度也越大( ) 6.孔轴的加工精度越高,则其配合精度也越高( ) 7.使用的量块数越多,组合出的尺寸越准确( ) 8.R z参数由于测量点不多,在反映微观几何形状高度方面的特性不如Ra参数充分( ) 9.粗加工时积屑瘤的存在增大了刀具的实际工作前角( ) 10.切断刀有两个主切削刃,一个副切削刃( ) 四.问答题(10分) 1.指出下列工件淬火后的回火方式,并说明原因 (1)45钢小轴 (2)60钢弹簧 (3)T12钢锉刀

《机械基础期末考试试卷》.doc

广东实验技工学校 2012—2013学年第一学期期末考试 《机械基础》科期末试卷A卷考试形式:闭卷 班级:姓名:学号: 题号- ?四五总分得分 %1.填空题。(每空1分,共25分)。 1 .机器_般由、、和组成。 2.普通V带的标记由、和部分组成。 3 .根据螺纹牙型不同,螺纹可分为、、和螺纹。 4.M12X2-7H8H-S中,12 表示, 2 表示, 7H 表不,S表示O 5.齿轮传动的传动比,指主动轮与从动轮的之比,与齿数成 ,用公式表示为。 6.标准直齿圆柱齿轮正确啮合的条件为:; 7.蜗轮回转方向的判定不仅与蜗杆的有关,而且还与蜗杆 的有关。 8.当急回运动行程速比系数时,曲柄摇杆机构有急回特性。 9.普通平键的规格采用标记,其截面尺寸应根据查表 选取。 %1.选择题(每小题2分,共30分)。 1 .普通螺纹的公称直径是指螺纹的()o A.大径 B.中径 C.小径

2.在相同的条件下,普通V带横截面尺寸(),其传递的功率也()

A.越小越大 B.越大越小 C.越大越大 3.台虎钳上螺杆螺纹采用的是() A.三角形螺纹 B.锯齿形螺纹 C.矩形螺纹 4.蜗杆传动中,蜗杆与蜗轮轴线在空间一般交错成()。 A. 30° B. 60° C. 90° 5.在()齿轮传动中,容易发生齿面磨损. A.开式 B.闭式 C.开式与闭式 6.国家标准规定,蜗杆以()参数为标准参数,蜗轮以()参数为标准参数。 A.端面 B.轴面 C.法面 7.当两轴相距较远,且要求瞬时传动比准确,应采用()传动。 A.带 B.链 C.轮系 8.家用缝纫机踏板机构采用的是()机构 A.曲柄摇杆 B.双摇杆 C.双曲柄 9.链的长度用链节数表示,链节数最好取()o A.偶数 B.奇数 C.任意数 10.键连接主要用于()场合。 A.拉力 B.横向力 C.扭矩 11.在皎链四杆机构中,能相对机架作整周旋转的连架杆为()o A.连杆 B.摇杆 C.曲柄 12.凸轮与从动件接触处的运动副属于()o A.局副 B.转动副 C.移动副 13.从动件作等加速等减速运动的凸轮机构()。 A.存在刚性冲击 B.存在柔性冲击 C.没有冲击 14.三星轮换向机构是利用()来实现从动轴回转方向的改变。 A.首轮 B.末轮 C.惰轮 15.在轴上支撑传动零件的部分称为()o A.轴颈 B.轴头 C.轴身

BEC商务英语高级真题及答案(5)

BEC商务英语高级真题及答案(5) In the last few years, managers throughout industry have seen more changes than many of them could have expected to see in their entire working lives having to communicate information which often leads to feelings of insecurity has become a key activity. From being regarded as relatively unimportant in many companies , management employee communication has become a central corporate need. Concordia International provides a good example of a company that has adjusted well to the changing needs for communication . since 1995 , Concordia has been turned inside-out and upside-down, to ensure that it is a marketing –led, customer-responsive business, one that looks outwards at customers and competitors, rather than inwards at its own processes and the way things were done in the past. In the last eight years, Concordia has reduced its workforce by more than 80.000 people - or 35% -on a voluntary basis, with further downsizing anticipated. From being an engineering company, Concordia is now remaking itself as a service company. The role of employee communication in such a context is to build people’s self-confidence, to persuade them that, although it is inevitable that the changes will go ahead, they also bring with them new opportunities for employees. However, this is not an easy task. People tend to be skeptical of these claims and to feel that they are losing touch with the company they have worked for over many years. This is understandable, since many of the old certainties are being swept away , including the core activities of the company they work for. Above all , they have had to face up to the fact that they no longer have a job for life. Research indicates that people respond to this predicament in a variety of ways. The bulk of employees fall into two main categories in terms of their response to the

采矿学模拟试卷及答案

1、1—() A、岩石运输大巷; B、m1回风平巷; C、盘区石门; D、盘区石门尽头回风斜巷。 2、2—() A、进风行人斜巷; B、m2上分层运输平巷; C、盘区回风大巷; D、m2上分层采煤 工作面。 3、3—() A、盘区石门; B、进风斜巷; C、区段岩石轨道集中平巷; D、区段煤仓。 4、4—() A、采煤工作面; B、回风运料斜巷; C、区段溜煤眼; D、盘区轨道上山。 5、5—() A、m1煤层采煤工作面; B、m2上分层回风平巷; C、无极绳绞车房; D、区段岩石轨道集中平巷。 6、6—() A、回风运料斜巷; B、区段岩石运输集中平巷; C、车场绕道; D、m1煤层回风平巷。 7、7—() A、m2上分层回风平巷; B、m1煤层回风平巷; C、区段岩石轨道集中平巷; D、区段煤仓。 8、8—() A、区段煤仓; B、车场绕道; C、m2煤层上分层运输平巷; D、进风斜巷。 9、9—() A、回风运料斜巷; B、区段进风斜巷; C、溜煤眼; D、材料道。 10、10—() A、进风行人斜巷; B、回风运料斜巷; C、溜煤眼; D、盘区石门尽头回风斜巷。 11、11—() A、回风运料斜巷; B、区段岩石轨道集中平巷; C、m1煤层运输平巷; D、m1煤层回风平巷。 12、12—() A、回风运料斜巷; B、材料道; C、进风行人斜巷; D、溜煤眼。 13、13—() A、区段岩石轨道集中平巷; B、材料道; C、m2煤层上分层区段运输平巷; D、m1煤层区段运输平巷。 14、14—() A、m2煤层上分层区段运输平巷; B、m1煤层区段运输平巷;

C、m1煤层区段回风平巷; D、进风斜巷。 15、15—() A、m2煤层上分层区段回风平巷; B、m2煤层上分层区段运输平巷; B、区段岩石轨道集中平巷;D、m1煤层区段回风平巷。 16、16—() A、进风斜巷; B、溜煤眼; C、车场绕道; D、m2煤层上分层区段回风平巷。 二、填空(每空1分,共10分) 17、在T = Z k /(A×K)的关系式中,T代表矿井服务年限,Z k代表矿井可采储量,A 代表????????????????????,K代表储量备用系数。 18、在缓倾斜煤层中的长壁工作面,炮采工艺方式是指采用爆破落煤、????????????????????装煤和人工装煤、可弯曲刮板输送机运煤及单体支柱支护的采煤工艺方式。 19、斜井开拓条件下,当煤层或岩层的倾角与斜井的倾角不一致时,斜井布置可以采用穿层斜井,煤层倾角较小时可以采用沿煤层顶板穿层斜井,煤层倾角较大时可以采用???????????????????????斜井。 20、井底车场内用于排水的副井主要硐室是?????????????????????????。 21、运输大巷采用轨道和矿车运输时,根据矿车的卸载方式(法)不同,分???????????????矿车和底卸式矿车两种。 22、采区下部车场按装车站位置不同,分大巷装车式、???????????????????装车式和绕道装车式下部车场三种类型。

机械制造基础试题及答案精选

《机械制造基础》 一、填空题 1.焊接电弧由三部分组成,即阴极区、阳极区、弧柱区。 2.直流弧焊机的输出端有正、负之分,焊接时电弧两端的极性不变;在正接中,焊件接弧焊机的_正极_,焊条接其_负极_。 3.焊条焊芯的作用是_导电_和_填充焊缝金属_。 4.电弧焊焊条按熔渣化学性质的不同,分为酸性焊条和碱性焊条。 5.焊条药皮原料的种类有稳弧剂、造气剂、造渣剂、脱氧剂、合金剂、黏结剂等 6.焊接接头中的热影响区包括熔合区、过热区、正火区、部分相变区。 7.焊接变形的基本形式有收缩变形、角变形、弯曲变形、扭曲变形、波浪形变形。 8.焊接变形的常用矫正方法是火焰加热矫正法、机械矫正法。 9.减少焊接变形的措施有加裕量法、刚性固定法、反变形法、选择合理的焊接次序等。 10.常用的电弧焊焊接方法有手工电弧焊、_埋弧焊_、_气体保护焊_等。 11.气焊火焰可分为中性焰、氧化焰和碳化焰。 12.按照接头形式电阻焊可分为三种,即点焊、缝焊和对焊。 13.常用的焊接接头形式有对接接头、角接接头、搭接接头、T形接头。 14.常用的特种焊接方法有超声波焊、真空电子束焊、激光焊、等离子弧焊、爆炸焊等。 15.难以进行气割的金属有铸铁、高碳钢、不锈钢、铜、铝等。 二、选择题 1.焊条药皮中加入淀粉和木屑的作用是(C)。 A.脱氧; B.造渣; C.造气; D.增加透气性 2.焊接薄板时,为防止烧穿可采用(D)。 A.交流电源; B.直流正接; C.任意电源; D.直流反接 3.在焊接接头中,综合性能最好的区域是(C)。 A.熔合区; B.过热区; C.正火区; D.部分相变区 4.对铝合金最合适的焊接方法是(C) A.电阻焊 B.电渣焊 C.氩弧焊 D.手工电弧焊 5.闪光对焊的特点是(B) A.焊接前先将被焊件接触 B.焊接前把被焊件安装好并保持一定距离 C.闪光对焊焊缝处很光滑 D.只能焊接相同的材料6.与埋弧自动焊相比,手工电弧焊的突出优点在于(C)。 A.焊接后的变形小 B.适用的焊件厚 C.可焊的空间位置多 D.焊接热影响区小 7.容易获得良好焊缝成形的焊接位置是(A)。 (A)平焊(B)立焊(C)横焊(D)仰焊 8.焊接厚度大于40mm的大件,可采用(D)焊接方法。(A)焊条电弧焊(B)电阻焊(C)钎焊(D)电渣焊 钢板对接时,一般应采用(C)焊接方法。 (A)埋弧焊(B)电阻焊(C)气焊(D)电渣焊 10.下列几种焊接方法中属于熔化焊的是(B)。 (A)点焊(B)气焊(C)缝焊(D)摩擦焊 11.用气焊焊接低碳钢时应选用的焊接火焰是(A)。(A)中性焰(B)氧化焰(C)碳化焰(D)任意火焰12.具有良好的焊接性能的材料是(A)。 (A)Q195(B)HT200(C)T12A(D)9SiCr 13、缝焊接头型式一般多采用[D]。 A.对接 B.角接字接 D.搭接 14.钢的焊接性常用评价指标是(C)。 A.钢含碳量 B.钢的合金元素含量 C.钢的碳当量 D.钢的合金元素总含量 15.下列焊接质量检验方法,属于非破坏性检验的是(B)。 A.金相检验 B.密封性检验 C.拉伸试验 D.断口检验 一、填空题(将正确答案填写在题中空缺的横线上。每空1分,共1×20=20分。)1.切削用量是指:切削速度、进给量、背吃刀量(切削深度)。 2.刀具角度标注的正交平面参考系由:基面、切削平面和正交平面组 成。 3.YT类硬质合金主要由:碳化钨、碳化钛和钴组成。 4.工艺基准按照用途不同可以分为:定位基准、测量基准、装配基准和 工序基准。 5.获得零件形状精度的方法有:轨迹法、成形法和展成法(范成法)。6.机械加工工序安排的原则是:先基准面,后其它面、先主要表面,后 次要表面、先主要平面,后主要孔 及先安排粗加工工序,后安排精加 工工序。 二、判断题(在每个小题前面的括号中做标记,正确者做“√”,错误者“×”。每小题1分,共1×10=10分。)

对口单招机械基础期末试卷

2014——2015学年第二学期13级 《机械基础及液压传动》期末试卷 班级姓名得分 一、填空题(每格0.5分,计20分) 1. 平键的截面尺寸bxh是根据由标准中选择;长度L则由而定。 2.平键的工作面是,而切向键的工作面是。一对切向键只能传递转矩,需要传递双向转矩时,可安装两对互成的切向键。 3.在紧键连接中,对轴削弱较严重的键连接是连接;多用于轻载或辅助性连接,尤其适用于锥形轴与轮毂的连接是连接。 4.传动中易产生附加动载荷的是联轴器。 5.销主要用于,和安全保护装置。 6. 联轴器可以连接两轴,传递,也可作为装置。 7.压力控制阀的共同特点都是利用和相平衡的原理来进行工作的。 8.直轴按其外形不同,可分为和两种。 9.轴上用来支撑回转零件的部分称为,被轴承支承的部位称为。 10.液压传动装置实质上是一种装置,它是以油液为工作介质,依靠来传递运动,依靠来传递动力。 11.液压传动中的油液既是传动的,又是,因此液压传动具有良好的性。 12.将两腔同时输入压力油,利用活塞两侧进行工作的液压缸称为差动液压缸。 13.双活塞杆液压缸采用缸体固定安装,工作台的往复运动范围为有效行程L的倍;采用活塞杆固定安装,工作台的往复运动范围约为有效行程L的倍。 14.液压缸缓冲的原理是增大,以降低活塞的运动速度。 15.某一差动液压缸,已知活塞面积为A1,活塞圩面积为A2。当u快进=u快退时,则A1:A2=_________________。当u快进=2u快退时,则A1:A2=________________。 16.在减压回路中,减压阀最低调整压力不小于________MPa,最高调整压力比该系统中溢流阀调定压力小__________MPa。 17.调速阀是由和两个阀联而成组成的。 18.某油泵的工作压力为2.5MPa;输出流量为48L/min,主轴转速为1200r/min,如将转速提高到1800r/min,则输出流量为L/min;如将负载加大一倍,此时油泵的工作压力为MPa。 19.进油节流调速回路中,用调速阀来代替节流阀的目的是提高

高级商务英语模拟试题1(可编辑修改word版)

全国职业能力测评考试 高级商务英语模拟试题(一) 第一部分模拟试题 I.In each of the following questions and select a different 1.A、bread B、dream C、lead D、team 2.A、hole B、none C、old D、fold 3.A、house B、south C、touch D、mouth 4.A、bush B、must C、rub D、truck 5.A、ease B、mean C、head D、heat II.The following example from the sentence chosen the right answer 6 、Adults sometimes envy children who play all the time they themselves have to work.rain or shine. A、while B、once C、since D、though 7、Talking to foreigners is fun if you the right time and place. A、locate B、consider C、choose D、decide

8、A person with the blood type AB can any type of blood. A、apply B、recognize C、receive D、absorb 9、In a second-hand bookshop ,Billy came across a book which he thought was certainly a edition. A、rare B、scarce C、seldom D、hardly 10、The red color can stimulate all our ,including appetite. A、thoughts B、worries C、senses D、desires 11、While I was waiting for her ,I killed time looking in the show windows. A、by B、with C、in D、over 12、Mrs.London has that she is unable to get a job. A、such small education B 、so little education C、a such little education D、a so small education 13、I come yesterday ,but I could not. A、was to have B、must C、ought D、have to 14、He treats it a request for information. A、for B、as C、like D、by 15、They promised each other when they went to work. A、get in touch with B、getting in touch with C、to get in touch with D、to get touch with 16、She was too shy to speak . A、in public B、in the public C、in a public D、at public 17、I often thought of my childhood, I lived on a farm. A、when B、which C、where D、who 18、I don’t like this hat.Please show me . A、another B、the other C、others D 、both 19、They shopping,when someone knocked at the door. A、are about to B、are to go C、were about to go D、were to go 20、He gained his by printing of famous writers. A、wealth; work B、wealthy ; works C、wealthy; work D、wealth;works III.The following example from the short space select the right answer Nobody wants to be 21 .Unfortunately our bodies can 22 problems.When we aren’t 23 ,our bodies tell us .Sometimes a part of our bodies hurts. When a part of our bodies 24 ,we say we have aches and pains. We can have aches and pains in 25 parts of the body. We call some simple 26 proplems“aches”.For example, we can have a headache,a toothache,an earache,a backache or a stomachache.Other simple problems are not 27 aches,so we describe them in different ways. For example,we can 28 a sore throat,a sore leg ,a sore toe. “Pain”is another word that we use to 29 a problem.We can have a pain in the chest, a pain in the shoulder or a pain 30 the back.A pain is strong. Also, a pain hurts in a specific place. When aches and pains aren’t too31 ,we can buy medicine in the drugstore . Usually small aches go away 32 .When pain is more serious ,we 33 to visit the doctor(or the dentist).The doctor asks us what our 34 are.The doctor may have to do tests or take Xrays to 35 what is wrong .Then he or she will tell us what to do. 21、A、sleep B、bad C、cold D、sick

[VIP专享]采矿学试卷A卷及答案

一、填空题(每空1分,共30分) 1)图1所示为单一走向长壁采煤法上山采区巷道布置图(包括平面图和剖面图),要求 回答数字代表的巷道名称: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 2)采煤工作面周而复始地完成、、、、 等工序的过程称为采煤循环。 3)滚筒采煤机的进刀方式有直接推入法进刀、和中部斜切进刀。 4)采煤工艺的类型有、和综合机械化开采三种,其中

综采面的主要设备有、和,综采与普采的区别在于工作面支护采用了。 5)在T = Z k /(A×K)的关系式中,T代表,Z k代表矿井可采储量,A 代表,K代表储量备用系数。 6)根据采煤工艺、矿压控制特点和工作面长度不同,采煤方法分为壁式体系和 体系两大类。 7)在缓倾斜煤层中的长壁工作面,炮采工艺方式是指采用落煤、爆破装煤和人工装煤、可弯曲刮板输送机运煤及单体支柱支护的采煤工艺方式。 二、名词解释(每题5分,共30分) 1).采煤方法: 2).及时支护:滞后支护: 3).采区车场: 4).矿井生产能力: 5).放煤步距(循环放煤步距):采放比: 6).石门: 三、简答题(共25分) 1).根据第一题填空题图1所示的采矿工程平面图,写出运煤、运料、通风系统(只用数字表示即可,并且新风和污风要分开写)。(6分) 2).煤层上山和岩石上山的比较。写出各自的布置位置、优缺点和适用条件。(8分) 3).简要说明合理井田位置要考虑的因素。(5分) 4)简述立井的优缺点和适用条件(6分) 四论述题(15分) 1)上、下山开采的比较(从开拓工程量、基建投资、水平垂高、水平服务年限及接替、运输、掘进、通风、排水、技术、基建投资、生产经营等方面比较)(10分) 2)写出下山开采的适用条件。(5分)

北京理工大学2020年5月《机械制造基础》作业考核试题答案

(254)北京理工大学远程教育学院2019-2020学年第二学期《机械制造基础》期末试卷(A卷) 教学站学号姓名手机号成绩 闭卷 要答案:wangjiaofudao 热加工部分 一、判断题,请将答案写在下面的表格中(共10分,每题1分) 1、灰铸铁不能锻造,但可锻铸铁塑性较好,可用于锻造加工。 2、在铸件的非加工表面上,尽量避免有披缝。 3、铸铁件的加工余量一般应大于铸钢件的加工余量。 4、熔模铸造较金属型铸造工艺简单,生产效率高。 5、离心铸造适用于生产薄壁铸件,但铸件易产生偏析。 6、自由锻可以进行镦粗及拔长操作,但不能进行弯曲操作。 7、锻件的锻造比越大,锻造后金属的力学性能越好。 8、闭式模锻时,可以不设置飞边槽。 9、对于特大型锻件,自由锻是有效的锻造手段。 10、钢球可以进行轧制生产。 二、选择题,请将答案写在下面的表格中(共40分,每题2分) 1、下列金属或合金中流动性能最好的是 A. 铸钢; B. 灰铸铁; C. 硅黄铜; D. 高碳钢 2、铸造合金的三个收缩阶段中,容易出现铸造应力、变形和裂纹等缺陷的阶段是 A. 液态收缩; B. 凝固收缩; C. 固态收缩 3、球墨铸铁的凝固方式为 A. 逐层凝固; B. 中间凝固; C. 糊状凝固; D. 其他凝固 4、铸造时,合金同时凝固有利于 A. 防止出现浇不足; B. 防止缩孔和缩松; C. 降低铸造应力; D. 提高铸件表面质量 5、可采用热处理方法消除的偏析是 A. 晶内偏析; B. 区域偏析; C. 体积质量偏析 6、对箱体铸件,为提高其刚度,应采取以下措施 A. 增加箱体壁厚; B. 换用刚度大的铸铁材料; C. 改变箱体结构; D. 箱体上设置加强筋 7、金属型铸造适用于 A. 壁厚在1mm以下的铸铝件的生产; B. 生产非铁铸件; C. 小批量生产; D. 生产大型铸件 8、把锻造划分为热锻、冷锻、温锻等加工方式的界限为 A. 锻造温度; B. 再结晶温度; C. 软化温度; D. 屈服点温度 9、可显著提高金属材料塑性变形能力的加工方法是 A. 锻造; B. 冲压; C. 挤压; D. 旋锻

BEC商务英语高级阅读真题

BEC商务英语高级阅读真题 The Negotiating T able You can negotiate virtually anything. Projects, resources, expectations and deadlines are all outcomes of negotiation. Some people negotiate deals for a living. Dr Herb Cohen is one of these professional talkers, called in by companies to negotiate on their??behalf . He approaches the art of negotiation as a game because, as he is usually negotiating for somebody else, he says this helps him drain the emotional content from his conversation. He is working in a competitive field and needs to avoid being too adversarial. Whether he succeeds or not, it is important to him to make a good impression so that people will recommend him. The starting point for any deal, he believes, is to identify exactly what you want from each other. More often than not,

采矿学I试题库及答案解析

《采矿学I》试题库 授课专业:采矿工程I 课程名称:采矿学 一、名词解释 1、矿石:凡是地壳里面的矿物集合体,在现代技术经济水平条件下,能以工业模从中提取国民经济所必需的金属或矿物产品的,就叫做矿石。 2、废石:在矿体周围的岩石(围岩)以及夹在矿体中的岩石(夹石),不含有用成分或含量过少当前不宜作为矿石开采的,则称为废石。 3、矿体:矿石的聚集体叫做矿体。 4、金属矿石:作为提取金属成分的矿石,称为金属矿石。 5、放出椭球体:当无限边界条件限制的情况下,根据实验得出,放出体为一近似椭球体,称之为放出椭球体。 6、矿石合格块度:爆破崩矿时,矿石破碎到适合放矿和运输条件的最大允许块度,叫做矿石合格块度。 7、阶段:在开采缓倾斜、倾斜和急倾斜矿体时,在井田中每隔一定的垂直距离,掘进一条或几条与走向一致的主要运输巷道,将井田在垂直方向上划分为矿段,这个矿段叫阶段。 8、矿石贫化率:因混入废石量和在个别情况下高品位粉矿的流失而造成矿石品位降低的百分率,叫做矿石贫化率。(或:工业储量矿石品位与采出矿石品位之差对采出工业储量矿石品位之比,

用百分数表示。) 9、矿田:划归一个矿山企业开采的全部矿床或其一部分。 10、井田:在一个矿山企业中划归一个矿井(坑口)开采的全部矿床或其一部分。 11、阶段:在开采缓倾斜、倾斜和急倾斜矿床时,在井田中每隔一定的垂直距离,掘进—条或几条与走向一致的主要运输巷道,将井田在垂直方向上划分为矿段,这个矿段叫阶段。 12、阶段高度:上下两个相邻阶段运输巷道底板之间的垂直距离,叫阶段高度。 13、阶段斜长:上下两个相邻阶般运输巷道沿矿体的倾斜距离。 14、矿块:在阶段中沿走向每隔一定距离,掘进天井连通上下两个相邻阶段运输巷道,将阶段再划分为独抛回采单元,称为矿块。 15、采区:在盘区中沿走向每隔—定距离,掘进采区巷道连通相邻两个盘区运输巷道,将盘区划分为独立的回采单元,这个单元称为采区。 16、矿石稳固性:是指矿石或岩石在空间允许暴露面积的大小和暴露时间长短的性能。 17、含水性:矿石或岩石吸收和保持水分的性能。 18、碎胀:矿岩破碎后,碎块之间有较大的空隙,其体积比原岩体积要增大,这种性质称为碎胀。 19、碎胀系数:矿岩碎胀后的体积与原岩体积之比。 20、矿体厚度:矿体上盘与下盘间的垂直距离或水平距离,前者称做垂直厚度或真厚度,后者称作水平厚度。 21、矿床开拓:从地面掘进一系列巷道通达矿体,以便把地下将要采出的矿石运至地面,同时把新鲜空气送入地下污浊空气排出地表,把矿坑水排出地表,把人员、材料和设备等送入地下和运出地面,形成提升、运输、通风、排水以及动力供应等完整系统,称为矿床开拓。 :是指在已开拓完毕的矿床里,掘进采准巷道,将阶段划分成矿块作为回采的独立单元,并在矿采准、22. 块内创造行人、凿岩、放矿、通风等条件。 23、采准系数:每一千吨采出矿石量所需掘进的采准、切割巷道米数。 24、采准的工作比重:采准切割巷道的采出矿量Tˊ与T 矿块采出的矿石总量之比。 25、切割工作:是指在已采准完毕的矿块里,为大规模回采矿石开辟自由面和自由空间(拉底或切割槽),有的还要把漏斗颈扩大成漏斗形状(称为辟漏),以为大规模采矿创造良好的爆破和放矿条件。 26、三级储量:将矿石储量按开采准备程度划分为开拓储量、采准储量、备采储量三级,称为三级储量。 27、开拓储量:凡设计所包括的开拓巷道均开掘完毕,构成主要运输,通风系统。并可掘进采准巷道者,则在此开拓巷道水平以上的设计储量 28、采准储量:在已开拓的矿体范围内,按设计规定的采矿方法所需掘进的采准巷道均已完毕,则此矿块的储量,叫采准储量。 29、备采储量:已做好采矿准备的矿块,完成了拉底空间或切割槽、辟漏等切割工程,可以立即进行采矿时,则次矿块内的储量称备采储量。 30、矿石损失:凡在开采过程中,造成矿石在数量上的减少,叫做矿石的损失。 31、矿石损失率:开采过程中损失的工业储量与工业储量之比,(%)。 32、矿石回采率:开采过程中,采出的纯矿石量与工业储量之比,(%)。 33、矿石贫化:开采过程中,造成矿石质量的降低,叫矿石的贫化。 34、废石混入率:采出矿石中的废石量与采出的矿石量之比率。(%) 35、崩落带:地表出现裂缝的范围内称为崩落带。 36、移动带:崩落带边界起至出现变形的地点,称为移动带。 37、崩落角:从地表崩落带的边界至开采最低边界的连线和水平面所构成的倾角,称为崩落角。

机械制造基础试卷及答案

《机械制造技术基础》试卷(闭卷)(A卷)出卷人: (请将正确答案填写在括号内。每空1分,共20分)Array 1、在切削过程中,工件上三个变化的表面是:___________ 、 ___________ 、___________ 。 2、每一个工序可分为若干个、、、。 3、定位误差由两部分组成,即误差和误差。 4、主轴的回转运动误差可分解为、和三种基本形式。 5、加工轴类零件时,通常用两端中心孔作为定位基准,这符合的原则。 6、机械加工质量包括和两个方面。 7、车削塑性材料时,切削热产生后从、、和周围介质中传散。 8、安排机械加工工序顺序的原则有基面先行原则、先粗后精原则、___________原则以及___________ 原则。 二、选择题(下列各题的备选答案中只有一个选项是正确的,请把正确答案 1、刃倾角为正值时,切屑流向( )。 A. 待加工表面 B. 已加工表面 C. 过渡表面 D. 垂直主刀刃方向 2、高速钢刀具在550-600℃时发生() A.磨料磨损 B. 粘结磨损(冷焊磨损) C. 扩散磨损 D. 相变磨损 E. 氧化磨损 3、精基准是用( )作为定位基准的。 A. 已加工过的表面 B. 未加工的表面 C. 精度最高的表面 D. 粗糙度值最低的表面 4、为保证各加工表面有较高的相互位置精度,应遵循( )。 A. 基准重合原则 B. 基准统一原则 C. 互为基准原则 D. 自为基准原则 5、在机械加工工艺过程中,要基准先行,这是为了( )。 A. 消除工件的残余变形 B. 使后道工序有精确的定位基面 C. 避免主要加工表面产生加工硬化 D. 减少精基面的表面粗糙度 6、为减少传动链误差对加工精度的影响,可采取的措施是( )。 A. 增加传动件数量 B. 降低传动元件加工精度 C. 采用校正装置 D. 采用增速传动

《机械基础》期末B卷考试题答案

学年第学期《机械基础》期末考试题 班级:姓名:学号:_____________ 题目一二三四五六总分登分签名 得分 一、填空题:(每空格1分,共20分) 1、机构要能够动,自由度必须大于零,机构具有确定运动的条件是机构自由度必须大于零并 且机构自由度数目与原动件数目相等。 2、两构件通过点或线接触组成的运动副称为高副;通过面接触组成的运动副称 为低副。 4、机构中的相对静止件称为机架,机构中按给定运动规律运动的构件称为从动件。 5、构件是机构的____运动单元,零件是是机构的 __制造_单元。 6、滚子从动件凸轮机构出现运动失真的原因是__理论轮廓曲线外凸时滚子半径大于理论 7、铰链四杆机构可演化成为曲柄滑块机构、__导杆机构、摇块机构、定块机构四种基 本类型。 8、在铰链四杆机构中,存在一个曲柄的条件是_最长杆与最短杆之和≦另外两杆之和、 机架或连架杆中必有一杆为最短杆。 9、带传动由于过载引起的全面滑动称为打滑,而由于带的弹性变形和拉力差而引起的滑 动称为弹性滑动。 10、渐开线上离基圆愈远的点,其压力角越大。 二、判断题(每题1分,共10分,对打“√”错打“×) 1、机构具有确定相对运动的条件是机构的原动件个数与机构的自由度 个数相等。(×) 2、铰链四杆机构具有急回特性的条件是行程速比系数K≤1。(×) 3、四杆机构的压力角越大,则机构的运动性能越好。(×) 4、曲柄摇杆机构的死点位置与极限位置重合。(×) 5、四杆机构的传动角就是连杆与从动件的夹角。(√) 6、尖端从动件盘形凸轮的理论轮廓与工作轮廓不是同一条曲 线。(×) 7、从动件的位移线图是凸轮轮廓设计的依据。(√) 8、传动的重合度越大,承载能力越强。(√) 9、齿轮插刀加工齿轮时,其运动由展成运动、切削运动、让刀运动组成。(×) 10、用齿条刀具切制轮齿时,如果实际极限啮合点B2低于理论极限啮合点N1时,则发生轮齿 的根切。(×) 三、选择填空题(每空格1分,20分) 1、构件是机构中( C )的单元;从动件行程速比系数为( E )时,机构具有急回特性。 A、联接 B、制造 C、运动 D、K>0 E、K≥1 F、K>1 2、机构运动简图是( B ),机构示意图是( A )。 A、用构件和运动副的代表符号,表示出机构运动特征的图形。 B、按一定的比例,用构件和运动副的代表符号,表示出机构运动特征的图形。 3、具有确定运动的机构,其原动件数目应_B___自由度数。 A、大于; B、等于; C、小于。 4、摆动导杆机构中,当曲柄为主动件时,其导杆的传动角始终为_B_。 A、900; B、00; C、450。 5、铰链四杆机构是按__D__的不同形式分为三种基本型式的。 A、摇杆; B、连架杆; C、连杆; D、曲柄。 6、缝纫机的脚踏板机构是以_A___为主动件的曲柄摇杆机构。 A、摇杆; B、连杆; C、曲柄。 7、一对心曲柄滑快机构,若以连杆为机架时,则将演化成__C__机构 第1页共4页

相关主题