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新编大学英语(第三版)综合教程课后习题参考答案

新编大学英语(第三版)综合教程课后习题参考答案
新编大学英语(第三版)综合教程课后习题参考答案

Unit 1 Personal Relationships

Exercises

Post-Reading

Reading Comprehension

1 1 A

2 B

3 A

4 A

5 B

6 C

7 A

8 C

2 1 killed 2 wounded

3 arrived

4 girl

5 badly / seriously

6 blood

7 none

8 American

9 type 10 orphans

11 French 12 difficulty 13 frightened 14 would 15 cried

16 Vietnamese 17 found 18 understand 19 willing 20 friend

3 Sample

V = Vietnamese nurse H = Heng N = Navy nurse

V: Is it hurting, Heng?

H: No.

V: So why are you crying? Is there anything wrong?

H: I’m sad that I will have to leave the world. I’m a little scared before I die. I don’t want to die, but I don’t want my friend to die, either.

V: Why do you think you are gong to die?

H: The doctor said unless I gave my blood to my friend, she would certainly die.

V: You must have misunderstood him. You only have to give some of your blood to the girl.

This won’t do any harm to your health.

H: Really? Are you sure?

V: Yes. Have a good sleep now. When you wake up, I’m sure you’ll be as strong as before.

V: (to the Navy nurse): He thought he was dying. He misunderstood you. He thought you had asked him to give all his blood to the little girl so that she could live.

N: But why would he be willing to do that?

V: Heng, the Navy nurse wants to know why you would be willing to give all your blood to the little girl?

H: She’s my friend.

Vocabulary

1 reply

2 land

3 supplied

4 wound

5 replied

6 signed

7 wounded 8 supplies 9 sign 10 balancing 11 land 12 balance

run: 1 D 2 A 3 C 4 E 5 F 6 B

match: 1 D 2 B 3 F 4 C 5 E 6 A

1 Insert

2 in the balance

3 requests

4 relief

5 let out

6 steady

7 stiff

8 misunderstood

9 limited 10 action

Translation

When I knew the details I realized that I should not have lost my temper in the office.

I don’t / didn’t know Bob very well, but we go / went out for an occasion al drink together.

The meeting is supposed to take place on Tuesday, but we have to postpone it / put it off. Our government took action to bring / get all the Chinese in that country back to China. Including weekends, there are only 12 more days to buy Christmas presents / gifts. Without immediate action, many kinds / species of wild animals would die from hunger. Part 3 Further Development

1 Grammar Review

Sample

A: Did you hear that Tom failed the English final? He was 10 minutes late for the final because he woke up late.

B: That’s too bad. But he should have asked his roommate to wake him up.

A: Well anyway, he got to the classroom before the listening part finished. But then he found the batteries for his radio were dead.

B: Well, he should have bought new batteries the day before.

A: Yes, very true. He then had to borrow two batteries from his classmate. But when Tom was doing the exam, he found there were many words that were new to him.

B: He should have spent more time memorizing new words and phrases before the exam.

A: Yes, and then Tom had a splitting headache because he had studied until two in the morning.

B: That’s too bad. But he really shouldn’t have stayed up the night before the exam.

A: And what’s more, Tom was so afraid to fail the fin al that he peeped at his neighbor’s paper. He was caught and would be punished.

B: Really? He shouldn’t have cheated on the exam.

2 Vocabulary Review

1 A Though / Although B though C though

A Both “although” and “though” can be used as conjunctions to in troduce a subordinate clause of concession (让步状语从句) in which you mention something which contrasts

with what you are saying in the main clause.

B “Though” is sometimes used as an adverb. When used as an adverb, it is not used at the beginning of a clause. “Although” cannot be used as an adverb.

C When a clause beginning with “though” ends with a complement or adverb, you can bring the complement or adverb forward to the beginning of the clause. However, when a clause beginning with “although” ends with a complement or adverb, you cannot move the complement or adverb to the beginning of the clause.

2 A reply / answer B answer C replying

Both “answer” and “reply” can be used as nouns and verbs. With a noun object we use the verb “answer” or “reply to”. e.g. We must answer / reply to these questions as soon as possible.

3 A speaks B speak C talking D speak / talk

You say that someone “speaks” or “can speak” a foreign language. If someone is giving a speech, you say they are “speaking”. If two or more people a re having a conversation, you say that they are “talking”. You do not say that they are “speaking”.

If you “speak to / talk to” someone, you have a conversation with them.

4 A injured / hurt B hurt / injured C wounded / injured D wounds

You can be “wounded” or receive a “wound” from any attack in which a gun or sharp instrument such as a sword or knife is used. You can be “hurt” or “injured” or receive an “injury”, a) when any other weapon such as a heavy stick or bomb is used, b) in an accident. Both “wound” and “injure” are more serious than “hurt”. Note that “hurt”

can be used as an intransitive verb but not “wound” or “injure”. e.g. It hurts when I try to move my leg.

5 A houses B apartment, apartments

A “house” is a building for people to live in and o ften has more than one level. An

“apartment” in American English or a “flat” in British English refers to a set of rooms within a larger building, usually on one level.

6 A aside B apart C aside / apart

Both “aside” and “apart” can be used as adverbs. “Aside” means “away or to the side”.

“Apart” means “separated by a distance”. The phrase “aside from / apart from” means

a) except for, b) in addition to.

7 A requests B requested C demanded D demands

Both “request” and “demand” mean “ask for sth. or ask sb. to do sth.”. “Request” is more formal and stronger than “ask (for)”. “Demand” is even stronger. If you “demand” something, you feel strongly that you have the right to get it, and will not take “no” for an answer. Both “request” and “demand” can be used as a verb or as a noun. A “request” for something is a polite demand for it.

8 A border B boundary

The word “border” refers to the dividing line between two countries or states or the land near that line. A “boundary” is a precise line marking the outer limi ts of an area.

3 Roommates and Friends

STEP ONE

Sample

In addition to those listed in the book, my ideal roommate would also be: someone who does not smoke; a responsible and honest person; someone who does not snore while sleeping; the best student in my class; someone who does not stay up too late;

an independent person; someone who does not interfere in my private affairs; a tolerant person; a trustworthy person, etc.

STEP TWO

Sample

? No, I don’t think roommates are usually friends. Living in the same room doesn’t necessarily mean that friendships will develop. Although roommates are usually friendly to each other, not all of them are friends because friendliness is not always an indication of friendship. It’s true with classmates. Only when people have similar interests and a common outlook on life will they become friends or close friends.

? I think more often than not roommates will become friends. Obviously, roommates spend much time together and therefore will learn a lot about each other. When people get to know each other, friendship often develops. Many people could have become friends if they had met and got together often or long enough. Sharing rooms paves the way to friendship. We often hear older people say they were roommates or classmates and therefore good friends. It doesn’t mean roommates will surely become friends. They’re more likely to become friends.

4 It Made Me Feel So Good

STEP TWO

Sample

? As a newcomer in this university, the first letter I’ve received here is from my best friend, Dong Ming. Dong Ming and I were classmates in high school and we spent a lot of time together, studying, talking and playing around. I can safely say that not a single day was spent without our being together during our senior high school years.

But no w we’re studying at two different universities far apart from each other.

His letter makes me feel as if we were together again, talking. And what’s important is not the letter itself but what he said in the letter.

Dear Dong Hao,

I felt sad when we left each other last Friday and yet a little happy about all the new things and the excitement ahead of us in our new college life. It’s what we want and need.

One thing is very important to both of us: to make more friends and to learn to get along with others. To do so I believe we should respect others—their point of view, their way of doing things, etc. Only in this way can we make more friends and make our campus life more interesting. What do you think? I look forward to your reply.

Best Wishes,

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综合教程3unit1 课后答案

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最新大学物理实验教材课后思考题答案

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有程序(各种语言皆可)、K值的取值范围、图 +5分 有程序没有K值范围和图 +2分 只有K值范围 +1分 有图和K值范围 +2分 2.(1).混沌具有内在的随机性:从确定性非线性系统的演化过程看,它们在混沌区的行为都表现出随机不确定性。然而这种不确定性不是来源于外部环境的随机因素对系统运动的影响,而是系统自发 精品文档

精品文档 产生的 (2).混沌具有分形的性质(3).混沌具有标度不变性(4).混沌现象还具有对初始条件的敏感依赖性:对具有内在随机性的混沌系统而言,从两个非常接近的初值出发的两个轨线在 经过长时间演化之后,可能变得相距“足够”远,表现出对初值的极端敏感,即所谓“失之毫厘,谬之千里”。 答对2条以上+1分,否则不给分,只举例的不给分。 四、半导体PN 结 (1)用集成运算放大器组成电流一电压变换器测量11610~10--A 电流,有哪些优点? 答:具有输入阻抗低、电流灵敏度高、温漂小、线性好、设计制作简单、结构牢靠等优点。 (2)本实验在测量PN 结温度时,应该注意哪些问题? 答:在记录数据开始和结束时,同时都要记录下干井中温度θ,取温度平均值θ。 (3)在用基本函数进行曲线拟合求经验公式时,如何检验哪一种函数式拟合得最好,或者拟合的经验公式最符合实验规律? 答:运用最小二乘法,将实验数据分别代入线性回归、指数回归、乘幂回归这三种常用的基本函数,然后求出衡量各回归方程好坏的拟合度R 2。拟合度最接近于1的函数,拟合得最好。 五、地磁场 (1)磁阻传感器和霍耳传感器在工作原理有什么区别? 答:前者是磁场变化引起材料阻值变化,最终使得电桥外接电压转变为对应的输出电压;后者是磁场变化引起流经材料内部的载流子发生偏转而产生电压。 (2)为何坡莫合金磁阻传感器遇到较强磁场时,其灵敏度会降低?用什么方法来恢复其原来的灵敏度? 答:传感器遇到强磁场感应时,对应的磁阻材料将产生磁畴饱和现象,外加磁场很难改变磁阻材料的

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(1)利用f=(D+d)(D-d)/4D 测量凸透镜焦距有什么优点? 答这种方法可以避免透镜光心位置得不确定而带来得测量物距与像距得误差。 (2)为什么在本实验中利用1/u+1/v=1/f 测焦距时,测量u与v都用毫米刻度得米尺就可以满足要求?设透镜由于色差与非近轴光线引起得误差就是1%。 答设物距为20cm,毫米刻度尺带来得最大误差为0、5mm,其相对误差为 0、25%,故没必要用更高精度得仪器。 (3)如果测得多组u,v值,然后以u+v为纵轴,以uv为横轴,作出实验得曲线属于什么类型,如何利用曲线求出透镜得焦距f。 答直线;1/f为直线得斜率。 (4)试证:在位移法中,为什么物屏与像屏得间距D要略大于4f? 由f=(D+d)(D-d)/4D →D2-4Df=d2→D(D-4f)=d2 因为d>0 and D>0 故 D>4f 1、避免测量u、ν得值时,难于找准透镜光心位置所造成得误差。 2、因为实验中,侧得值u、ν、f都相对较大,为十几厘米到几十厘米左右,而误差为1%,即一毫米到几毫米之间,所以可以满足要求。 3、曲线为曲线型曲线。透镜得焦距为基斜率得倒数。 ①当缝宽增加一倍时,衍射光样得光强与条纹宽度将会怎样变化?如缝宽减半,又怎样改变? 答: a增大一倍时, 光强度↑;由a=Lλ/b ,b减小一半 a减小一半时, 光强度↓;由a=Lλ/b ,b增大一倍。 ②激光输出得光强如有变动,对单缝衍射图象与光强分布曲线有无影响?有何影响? 答:由b=Lλ/a、无论光强如何变化,只要缝宽不变,L不变,则衍射图象得光强分布曲线不变(条纹间距b不变);整体光强度↑或者↓。

③用实验中所应用得方法就是否可测量细丝直径?其原理与方法如何? 答:可以,原理与方法与测单狭缝同。 ④本实验中,λ=632。8nm ,缝宽约为5*10^-3㎝,屏距L 为50㎝。试验证: 就是否满足夫朗与费衍射条件? 答:依题意: L λ=(50*10^-2)*(632、8*10^-9)=3、164*10^-7 a^2/8=(5*10^-5)^2/8=3、1*10^-10 所以L λ<20θ,(10θ人为控制在mv )03.050.3(±); 2)测量散热板在20θ附近得冷却速率。 4、试述稳态法测不良导体导热系数得基本原理。

MATLAB基础教程薛山第二版课后习题答案讲解

《及应用》实验指导书 《及应用》实验指导书 班级: T1243-7 姓名:柏元强 学号: 20120430724 总评成绩: 汽车工程学院 电测与汽车数字应用中心

目录 实验04051001 语言基础..................... 错误!未指定书签。实验04051002 科学计算及绘图............. 1错误!未指定书签。实验04051003 综合实例编程.. (31)

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(2) e3 (3) (60) (3) (3*4) 3.设,,计算: (1) (2) (3) 23; (4*u*v)(v) (((u))^2)/(v^2) ((3*v))/(u*v) 4.计算如下表达式: (1) (2) (3-5*i)*(4+2*i) (2-8*i) 5.判断下面语句的运算结果。 (1) 4 < 20

(2) 4 <= 20 (3) 4 20 (4) 4 20 (5) 'b'<'B' 4 < 20 , 4 <= 20,4 20,4 20,'b'<'B' 6.设,,,,判断下面表达式的值。 (1) (2) (3) (4) (5) (6) 395837; a><>>> 7.编写脚本,计算上面第2题中的表达式。 ('(60)='); ((60)) ('(3)='); ((3)) ('(3*4)='); ((3*4)) 8.编写脚本,输出上面第6题中的表达式的值。395837;

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X M L基础教程课后习 题解答 内部编号:(YUUT-TBBY-MMUT-URRUY-UOOY-DBUYI-0128)

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袋,他们脸色苍白,睡眼惺忪,却很自豪,好像这些都是表彰他们勤奋好学的奖章。 (2)明天行吗?明天只是个谎言;根本就没有什么明天,只有一张我们常常无法兑现的期票。明天甚至压根儿就不存在。你早上醒来时又是另一个今天了,同样的规则又可以全部套用。明天只是现在的另一种说法,是一块空地,除非我们开始在那里播种,否则它永远都是空地。你的时间会流逝(时间就在我们说话的当下滴答滴答地走着,每分钟顺时针走60秒,如果你不能很好地利用它,它就会走得更快些),而你没有取得任何成就来证明它的存在,唯独留下遗憾,留下一面后视镜,上面写满了“本可以做”“本应该做”“本来会做”的事情。 7.(1)Students differ about whether they should have their future mapped out when they are still at university .Some think they should have a definite goal and detailed plan, so as to brace themselves for any challenges, whereas some others think they don’t have to think much about the future , because future is full of uncertainties. (2)After a very careful check-up ,the scientist was told he had got a fatal disease .Although he knew that his life was ticking away ,instead of complaining about the fate ,the scientist decided to make the best of the remaining days ,and speed up the research project he and his colleagues initiated ,and have a shot at completing it ahead of schedule.

大学物理学(第三版)课后习题参考答案

习题1 1.1选择题 (1) 一运动质点在某瞬时位于矢径),(y x r 的端点处,其速度大小为 (A)dt dr (B)dt r d (C)dt r d | | (D) 22)()(dt dy dt dx [答案:D] (2) 一质点作直线运动,某时刻的瞬时速度s m v /2 ,瞬时加速度2 /2s m a ,则一秒钟后质点的速度 (A)等于零 (B)等于-2m/s (C)等于2m/s (D)不能确定。 [答案:D] (3) 一质点沿半径为R 的圆周作匀速率运动,每t 秒转一圈,在2t 时间间隔中,其平均速度大小和平均速率大小分别为 (A) t R t R 2, 2 (B) t R 2,0 (C) 0,0 (D) 0,2t R [答案:B] 1.2填空题 (1) 一质点,以1 s m 的匀速率作半径为5m 的圆周运动,则该质点在5s 内,位移的大小 是 ;经过的路程是 。 [答案: 10m ; 5πm] (2) 一质点沿x 方向运动,其加速度随时间的变化关系为a=3+2t (SI),如果初始时刻质点的速度v 0为5m·s -1,则当t 为3s 时,质点的速度v= 。 [答案: 23m·s -1 ] (3) 轮船在水上以相对于水的速度1V 航行,水流速度为2V ,一人相对于甲板以速度3V 行走。如人相对于岸静止,则1V 、2V 和3V 的关系是 。 [答案: 0321 V V V ]

1.3 一个物体能否被看作质点,你认为主要由以下三个因素中哪个因素决定: (1) 物体的大小和形状; (2) 物体的内部结构; (3) 所研究问题的性质。 解:只有当物体的尺寸远小于其运动范围时才可忽略其大小的影响,因此主要由所研究问题的性质决定。 1.4 下面几个质点运动学方程,哪个是匀变速直线运动? (1)x=4t-3;(2)x=-4t 3+3t 2+6;(3)x=-2t 2+8t+4;(4)x=2/t 2-4/t 。 给出这个匀变速直线运动在t=3s 时的速度和加速度,并说明该时刻运动是加速的还是减速的。(x 单位为m ,t 单位为s ) 解:匀变速直线运动即加速度为不等于零的常数时的运动。加速度又是位移对时间的两阶导数。于是可得(3)为匀变速直线运动。 其速度和加速度表达式分别为 2 2484 dx v t dt d x a dt t=3s 时的速度和加速度分别为v =20m/s ,a =4m/s 2。因加速度为正所以是加速的。 1.5 在以下几种运动中,质点的切向加速度、法向加速度以及加速度哪些为零哪些不为零? (1) 匀速直线运动;(2) 匀速曲线运动;(3) 变速直线运动;(4) 变速曲线运动。 解:(1) 质点作匀速直线运动时,其切向加速度、法向加速度及加速度均为零; (2) 质点作匀速曲线运动时,其切向加速度为零,法向加速度和加速度均不为零; (3) 质点作变速直线运动时,其法向加速度为零,切向加速度和加速度均不为零; (4) 质点作变速曲线运动时,其切向加速度、法向加速度及加速度均不为零。 1.6 |r |与r 有无不同?t d d r 和d d r t 有无不同? t d d v 和t d d v 有无不同?其不同在哪里?试举例说明. 解:(1)r 是位移的模, r 是位矢的模的增量,即r 12r r ,12r r r ; (2) t d d r 是速度的模,即t d d r v t s d d . t r d d 只是速度在径向上的分量. ∵有r r ?r (式中r ?叫做单位矢),则 t ?r ?t r t d d d d d d r r r 式中 t r d d 就是速度在径向上的分量,

大学物理实验课后答案

大学物理实验课后答案 Final revision by standardization team on December 10, 2020.

(1)利用f=(D+d)(D-d)/4D 测量凸透镜焦距有什么优点 答这种方法可以避免透镜光心位置的不确定而带来的测量物距和像距的误差。(2)为什么在本实验中利用1/u+1/v=1/f 测焦距时,测量u和v都用毫米刻度的米尺就可以满足要求设透镜由于色差和非近轴光线引起的误差是1%。 答设物距为20cm,毫米刻度尺带来的最大误差为,其相对误差为%,故没必要用更高精度的仪器。 (3)如果测得多组u,v值,然后以u+v为纵轴,以uv为横轴,作出实验的曲线属于什么类型,如何利用曲线求出透镜的焦距f。 答直线;1/f为直线的斜率。 (4)试证:在位移法中,为什么物屏与像屏的间距D要略大于4f 由f=(D+d)(D-d)/4D → D2-4Df=d2→ D(D-4f)=d2 因为d>0 and D>0 故D>4f 1.避免测量u、ν的值时,难于找准透镜光心位置所造成的误差。 2.因为实验中,侧的值u、ν、f都相对较大,为十几厘米到几十厘米左右,而误差为1%,即一毫米到几毫米之间,所以可以满足要求。 3.曲线为曲线型曲线。透镜的焦距为基斜率的倒数。 ①当缝宽增加一倍时,衍射光样的光强和条纹宽度将会怎样变化如缝宽减半,又怎样改变 答: a增大一倍时, 光强度↑;由a=Lλ/b ,b减小一半 a减小一半时, 光强度↓;由a=Lλ/b ,b增大一倍。 ②激光输出的光强如有变动,对单缝衍射图象和光强分布曲线有无影响有何影响 答:由b=Lλ/a.无论光强如何变化,只要缝宽不变,L不变,则衍射图象的光强分布曲线不变 (条纹间距b不变);整体光强度↑或者↓。 ③用实验中所应用的方法是否可测量细丝直径其原理和方法如何 答:可以,原理和方法与测单狭缝同。 ④本实验中,λ=632。8nm,缝宽约为5*10^-3㎝,屏距L为50㎝。试验证: 是否满足夫朗和费衍射条件 答:依题意: Lλ=(50*10^-2)*(*10^-9)=*10^-7 a^2/8=(5*10^-5)^2/8=*10^-10 所以Lλ<

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