AP Physics C Mechanics Practice Tests
The questions contained in this AP ? Physics C: Mechanics Practice Exam are written to the content specifications of AP Exams for this subject. Taking this practice exam should provide students with an idea of their general areas of strengths and weaknesses in preparing for the actual AP Exam. Because this AP Physics C: Mechanics Practice Exam has never been administered as an operational AP Exam, statistical data are not available for calculating potential raw scores or conversions into AP grades.This AP Physics C: Mechanics Practice Exam is provided by the College Board for AP Exam preparation. Teachers are permitted to download the materials and make copies to use with their students in a class-room setting only. To maintain the security of this exam, teachers should collect all materials after their administration and keep them in a secure location. Teachers may not redistribute the files electronically for any reason.
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Practice Exam
Advanced Placement Program
AP ?
Physics C: Mechanics
Contents
Directions for Administration (ii)
Section I: Multiple-Choice Questions (1)
Section II: Free-Response Questions (14)
Student Answer Sheet for Multiple-Choice Section (22)
Multiple-Choice Answer Key (23)
Free-Response Scoring Guidelines (24)
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AP? Physics C: Mechanics
Directions for Administration
The AP Physics C: Mechanics Exam is one and one-half hours in length and consists of a multiple-choice section and a free-response section.
?The 45-minute multiple-choice section contains 35 questions and accounts for 50 percent of the final grade.
?The 45-minute free-response section contains 3 questions and accounts for 50 percent of the final grade.
Students should be given a 10-minute warning prior to the end of each section of the exam. A 10-minute break should be provided after Mechanics is completed if students are taking Physics C: Electricity and Magnetism immediately after Mechanics.
The actual AP Physics C Exams are administered in one session, Mechanics first followed by Electricity and Magnetism. Students taking only one of the exams will have the most realistic experience if both sections are completed in one session. Similarly, students taking both Physics C exams will have the most realistic experience if both exams are completed in one session and a complete morning or afternoon is available to administer them. If a schedule does not permit one time period for administration, it would be acceptable to administer Mechanics on one day and Electricity and Magnetism on a subsequent day, or to further break things up and administer Section I and Section II of each exam on subsequent days.
Many students wonder whether or not to guess the answers to the multiple-choice questions about which they are not certain. It is improbable that mere guessing will improve a score. However, if a student has some knowledge of the question and is able to eliminate one or more answer choices as wrong, it may be to the student’s advantage to answer such a question.
?The use of calculators is permitted only on Section II. Straightedges or rulers are allowed on both parts of the exam.
?It is suggested that the practice exam be completed using a pencil to simulate an actual administration.
?Teachers will need to provide paper for the students to write their free-response answers. Teachers should provide directions to the students indicating how they wish the responses to be labeled so the teacher will be able to associate the student’s response with the question the student intended to answer.
?The 2008–2009 AP Physics C table of information is included as a part of Section I. The table and the AP Physics C equation lists are included with Section II. The equation lists are not allowed for Section I. If you use these exams in subsequent years you should download the newer versions of the table and lists from AP Central.
?Remember that students are not allowed to remove any materials, including scratch work, from the testing site.
Section I
Multiple-Choice Questions
meter, m mole, mol watt, W farad, F kilogram, kg hertz, Hz coulomb, C tesla, T second, s newton, N volt, V degree Celsius, C ∞
ampere, A pascal, Pa ohm, W
electron-volt, eV UNIT
SYMBOLS
kelvin, K joule, J henry,
H
PREFIXES
Factor Prefix Symbol
910 giga G 610 mega M 310
kilo k
210- centi c 310-
milli m 610- micro m
910-
nano n 1210-
pico p
The following conventions are used in this exam.
I. Unless otherwise stated, the frame of reference of any problem is
assumed to be inertial. II. The direction of any electric current is the direction of flow of positive
charge (conventional current).
III. For any isolated electric charge, the electric potential is defined as zero at
an infinite distance from the charge.
PHYSICS C: MECHANICS
SECTION I Time—45 minutes 35 Questions
Directions: Each of the questions or incomplete statements below is followed by five suggested answers or
completions. Select the one that is best in each case and place the letter of your choice in the corresponding box on the student answer sheet.
Note: To simplify calculations, you may use 210m/s g = in all problems.
1. Which of the following graphs of position d versus time t corresponds to motion of an object in a straight line with positive acceleration?
(A)
(B)
(C)
(D)
(E)
2. A ball is thrown straight up from a point 2 m
above the ground. The ball reaches a maximum height of 3 m above its starting point and then
falls 5 m to the ground. When the ball strikes the
ground, what is its displacement from its starting
point?
(A) Zero
(B) 8 m below (C) 5 m below (D) 2 m below (E) 3 m above
3. What do acceleration and velocity have in
common?
(A) Both are scalars. (B) Both are vectors.
(C) Both are measured in units of distance
divided by time.
(D) Both are measured in units of distance
divided by time squared.
(E) They are different names for the same
quantity.
4. Two projectiles are launched with the same initial
speed from the same location, one at a 30∞ angle and the other at a 60∞ angle with the horizontal. They land at the same height at which they were launched. If air resistance is negligible, how do the projectiles’ respective maximum heights, 30H
and 60H , and times in the air, 30T and 60T , compare with each other?
Maximum Height Time in Air (A) 3060H H > 3060T T > (B) 3060H H > 3060T T < (C) 3060H H =
3060T T =
(D) 3060H H < 3060T T > (E)
3060H H <
3060T T <
5. An object of mass 100 kg is initially at rest on a
horizontal frictionless surface. At time t = 0, a
horizontal force of 10 N is applied to the object
for 1 s and then removed. Which of the following is true of the object at time t = 2 s if it is still on
the surface?
(A) It is at the same position it had at t = 0, since
a force of 10 N is not large enough to move
such a massive object.
(B) It is moving with constant nonzero
acceleration.
(C) It is moving with decreasing acceleration.
(D) It is moving at a constant speed.
(E) It has come to rest some distance away from
the position it had at t = 0.
6. Several forces act on an object, but the object is in
equilibrium. Which of the following statements
about the object must be true?
I.It has zero acceleration.
II.The net force acting on it is zero.
III.It is at rest.
IV.It is moving with constant velocity.
(A) I and II
(B) I and III
(C) I and IV
(D) II and III
(E) II and IV
Questions 7-8
A rock is thrown from the edge of a cliff with an initial velocity 0u at an angle q with the horizontal as shown above. Point P is the highest point in the rock’s trajectory and point Q is level with the starting point. Assume air resistance is negligible.
7. Which of the following correctly describes the
horizontal and vertical speeds and the acceleration of the rock at point P ?
Horizontal Vertical
Speed Speed Acceleration
(A) 0cos
u q0 g
(B) 0 0 g
(C) 0cos
u q 0 0
(D) 0cos
u q0sin
u q g
(E) 0 0cos
u q 0
8. Which of the following correctly describes the
horizontal and vertical speeds and the acceleration of the rock at point Q ?
Horizontal Vertical
Speed Speed Acceleration
(A) 0cos
u q0 g
(B) 0 0 g
(C) 0cos
u q 0 0
(D) 0cos
u q0sin
u q g
(E) 0 0cos
u q 0
9. As shown in the figure above, a child of mass
20 kg who is running at a speed of 4.0 m/s jumps
onto a stationary sled of mass 5.0 kg on a frozen
lake. The speed at which the child and sled begin to slide across the ice is most nearly
(A) 0.20 m/s
(B) 0.80 m/s
(C) 1.2 m/s
(D) 3.2 m/s
(E) 16 m/s
10. A toy spacecraft is launched directly upward.
When the toy reaches its highest point, a spring
is released and the toy splits into two parts with
masses of 0.02 kg and 0.08 kg, respectively.
Immediately after the separation, the 0.02 kg
part moves horizontally due east. Air resistance
is negligible. True statements about the 0.08 kg
part include which of the following?
I.It could move north immediately after the
spring is released.
II.It takes longer to reach the ground than does the 0.02 kg part.
III.It strikes the ground farther from the launch point than does the 0.02 kg part.
(A) None
(B) I only
(C) III only
(D) I and II only
(E) II and III only
11. A student initially stands on a circular platform
that is free to rotate without friction about its
center. The student jumps off tangentially, setting the platform spinning. Quantities that are
conserved for the student-platform system as the student jumps include which of the following?
I.Angular momentum
II.Linear momentum
III.Kinetic energy
(A) I only
(B) II only
(C) I and II only
(D) II and III only
(E) I, II, and III 12. In an experiment with a simple pendulum,
measurements of the period T of the pendulum
are made for different values of its length L.
When plotted on a graph, which of the following should result in a straight-line fit of the data?
(A) versus L
(B) T versus L
(C) T versus 2L
(D) 2T versus L
(E) 2T versus 2L
_________________________________________
13. A comet moves in the Sun’s gravitational field,
following the path shown above. What happens to its angular momentum as it moves from point X
to point Y ?
(A) It increases steadily.
(B) It remains constant.
(C) It decreases steadily.
(D) It increases as it approaches the Sun and
decreases as it moves away from the Sun.
(E) It decreases as it approaches the Sun and
increases as it moves away from the Sun.
14. Satellite X moves around Earth in a circular orbit
of radius R. Satellite Y is also in a circular orbit
around Earth, and it completes one orbit for every eight orbits completed by satellite X. What is the orbital radius of satellite Y ?
(A) 1 4 R
(B) 1 2 R
(C) 2R
(D) 4R
(E) 8R
15. A newly discovered planet is found to have twice
the radius and five times the mass of Earth. If the acceleration of gravity at the surface of Earth is g, the acceleration of gravity at the surface of the
new planet is
(A) 2 5 g
(B)
4g (C) g
(D) 5 4 g
(E) 5
2
g
Questions 16-17
A toy car of mass 6 kg, moving in a straight path,
experiences a net force given by the function F = ?3t.
At time t = 0, the car has a velocity of 4 m/s in the
positive direction and is located +8 m from the origin.
16. The car will come instantaneously to rest at time t
equal to
(A)
2s
3
(B) s
(C) s
(D) s
(E) 4
s
17. Which of the following best shows a graph of
position d versus time t for the car?
(A)
(B)
(C)
(D)
(E)
Questions 18-19
A block of mass 1M on a horizontal table is connected to a hanging block of mass 2M by a string that passes over a pulley, as shown above. The acceleration of the blocks is 0.6g . Assume that friction and the mass of the string are negligible.
18. The tension T in the string is
(A) zero (B) 0.4 2M g (C) 0.6 2M g (D) 1.0 2M g (E) 1.6 2M g
19. The ratio of masses 21M M is
(A) 0.67 (B) 1.0 (C) 1.4 (D) 1.5 (E) 1.6
Questions 20-21
In the system of two blocks and a spring shown above, blocks 1 and 2 are connected by a string that passes over a pulley. The initially unstretched spring connects block 1 to a rigid wall. Block 1 is released from rest, initially slides to the right, and is eventually brought to rest by the spring and by friction on the horizontal surface.
20. Which of the following is true of the energy of the
system during this process?
(A) The total mechanical energy of the system
is conserved.
(B) The total mechanical energy of the system
increases.
(C) The energy lost to friction is equal to the gain
in the potential energy of the spring.
(D) The potential energy lost by block 2 is less in
magnitude than the potential energy gained by the spring.
(E) The potential energy lost by block 2 is greater
in magnitude than the potential energy gained by the spring.
21. After block 1 comes to rest, the force exerted on it
by the spring must be equal in magnitude to
(A) zero
(B) the frictional force on block 1
(C) the vector sum of the forces on block 1 due to
friction and tension in the string
(D) the sum of the weights of the two blocks (E) the difference in the weights of the two
blocks
22. The graph above shows the force acting on an
object as a function of time. The change in
momentum of the object from time 0 to t is
(A) 2Ft
(B) Ft
(C) 1
2 Ft
(D) 1
4 Ft
(E) zero
Questions 23-24
A moon of mass m orbits a planet of mass 49m in an elliptical orbit as shown above. When the moon is at point A, its distance from the center of the planet is r A and its speed is 0u. When the moon is at point B, its speed is 0
5u.
23. When the moon is at point A, the distance from
the moon to the center of mass of the planet-moon system is most nearly
(A)
1
50A
r
(B)
1
A
r
(C)
1
2A
r
(D)
6
A
r
(E)
49
50A
r
24. When the moon is at point B, the distance from
the moon to the center of the planet is most nearly
(A)
1
25A
r
(B)
1
5A
r
(C) A r
(D) A r
(E) A r
Questions 25-26
The bar shown above is pivoted about one end and is initially at rest in a vertical position. The bar is displaced slightly and as it falls it makes an angle q with the vertical at any given time, as shown above.
25. Which of the following graphs best represents the
bar’s angular acceleration a as a function of
angle q ?
(A)
(B)
(C)
(D)
(E)
26. Which of the following graphs best represents the bar’s angular velocity w as a function of time?
(A)
(B)
(C)
(D)
(E)
27. A stone falls from rest from the top of a building
as shown above. Which of the following graphs best represents the stone’s angular momentum L about the point P as a function of time?
(A)
(B)
(C)
(D)
(E)
x (m) F (N)
0 0
1 1
2 8
3 27
4 64
28. A specially designed spring is stretched from
equilibrium to the distances x given in the table
above, and the restoring force F is measured
and recorded in each case. What is the potential
energy of the spring when it is stretched 3 m from equilibrium?
(A)
9
J
2
(B) 9 J
(C)
81
J
4
(D) 27 J
(E)
81
J
2
29. An object on the end of a spring with spring
constant k moves in simple harmonic motion
with amplitude A and frequency f. Which of the
following is a possible expression for the kinetic
energy of the object as a function of time t ?
(A) ()
22
sin2
kA ft
p
(B) ()
22
1
cos2
2
kA ft
p
(C) ()
1
sin2
2
kA ft
p
(D) ()
cos2
kA ft
p
(E) ()
sin2cos2
kA ft ft
p p
+
30. When a certain spring is stretched by an
amount x , it produces a restoring force of ()2,=-+F x ax bx where a and b are constants. How much work is done by an external force in stretching the spring by an amount D from its equilibrium length? (A) 2aD bD -+ (B) 2a bD - (C)
231123
-aD bD (D) 23-+aD bD (E) 2
3
23-+aD bD
Questions 31-32 refer to the following.
A uniform ladder of weight W leans without slipping against a wall making an angle q with a floor as
shown above. There is friction between the ladder and the floor, but the friction between the ladder and the wall is negligible.
31. The magnitude of the normal force exerted by the
floor on the ladder is
(A) W (B) sin W q
(C) cos W q (D)
sin 2W
q (E) cos 2W q
32. The magnitude of the friction force exerted on the
ladder by the floor is
(A) 2W tan q (B) W (C) cot W q
(D) 2W (E) cot 2W q
33. An ideal spring with spring constant k is cut in
half. What is the spring constant of either one
of the two half springs?
(A)
2
k
(B)
(C) k
(D) 2k
(E) 2k 34. A rocket has landed on Planet X, which has half
the radius of Earth. An astronaut onboard the
rocket weighs twice as much on Planet X as on
Earth. If the escape velocity for the rocket taking off from Earth is 0u, then its escape velocity on Planet X is
(A) 0
2u
(B) 0
(C) 0u
(D) 02
u
(E) 04
u
35. Suppose that a hole is drilled through the center
of Earth to the other side along its axis. A small object of mass m is dropped from rest into the hole at the surface of Earth, as shown above. If Earth is assumed to be a solid sphere of mass M and radius R and friction is assumed to be negligible, correct expressions for the kinetic energy of the mass as it passes Earth’s center include which of the following ?
I. 1
2MgR II. 1
2mgR
III.
2GmM
R
(A) I only (B) II only (C) III only
(D) I and III only (E) II and III only
S T O P
END OF MECHANICS SECTION I
IF YOU FINISH BEFORE TIME IS CALLED,
YOU MAY CHECK YOUR WORK ON MECHANICS SECTION I ONLY.
DO NOT TURN TO ANY OTHER TEST MATERIALS.
Section II
Free-Response Questions
TABLE OF INFORMATION FOR 2008 and 2009
meter, m mole, mol
watt, W farad, F kilogram, kg hertz, Hz coulomb, C tesla, T second, s newton, N volt, V degree Celsius, C ∞
ampere, A pascal, Pa ohm, W
electron-volt, eV UNIT SYMBOLS
kelvin, K joule, J henry,
H
PREFIXES
Factor Prefix Symbol
910 giga G 610 mega M 310 kilo k
210- centi c 310- milli m 610- micro m
910- nano n
1210-
pico p
The following conventions are used in this exam.
I. Unless otherwise stated, the frame of reference of any problem is
assumed to be inertial. II. The direction of any electric current is the direction of flow of positive
charge (conventional current).
III. For any isolated electric charge, the electric potential is defined as zero at
an infinite distance from the charge.
ADVANCED PLACEMENT PHYSICS C EQUATIONS FOR 2008 and 2009
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价或指导价可供参照时，合同价款的确定规则为（）。 A、按照订立合同时履行地的市场价格履行 B按照履行合同时履行地的市场价格履行 C按照纠纷发生时履行地的市场价格履行 D按照订立合同时订立地的市场价格履行 【正确答案】A 【您的答案】 4、A公司与B服装厂签订一份服装的买卖合同，约定货到后再付款。后B服装厂因生产资金紧缺，要求A公司先行支付一部分货款，遭A公司拒绝。A公司行使的该项权利在法律称之为（）。 A、同时履行抗辩权 B不安抗辩权 C后履行抗辩权 D抗辩权 【正确答案】C 【您的答案】 5、甲与乙订立买卖合同，合同到期，甲按约定交付了货物，但乙以资金紧张为由迟迟不支付货款。之后，甲了解到，乙借给丙的一笔款项已到期，但乙一直不向丙催讨欠款，于是，甲向人民法院请求以甲的名义向丙催讨欠款。甲请求人民法院以自己的名义向丙催讨欠款的权利在法律上称为（）。 A、代位权
五年制基础英语期末试题及答案(最新)
PartI I 一．单项选择。（共20 小题，每小题 1 分，共20 分。） 1. Do you like playing ______ by yourself ? A. on B. around C. with 2. Would you like _______ ice cream ? A. some B. any C. many 3. Have you finished _____ your homework? A. with B. do C. doing 4. I won ’t visit that place ______. A. any better B. more C. any more 5. How much are the _____? A. bread B. potatos C. tomatoes 6. Would you like some _______? A. milk B. milks C. milk ’s 7. They are from different _______. A. country B. countrys C. countries 8. Why are ______ interested in _______? A. Chinese , tea B. Chineses , teas C. Chinese , teas 9. Could you help ____ with ____English , please ? A. I , my B. me, me C. me，my 10. usually go to Church every Sunday 。 A The Browns B Brown C. the Brown 11. _____ young should look after ______ old. A. The, the B. A, A C. The, a 12. The little boy gets____on his way home. A. lose B. lost C. loses 13. I like going to school ______ foot. A. by B. on C. with 14. Can I try this dress_____. A. in B. on C. up 15. Either the apples or the milk_____ good for your health. A. is B. are C. do 16. When did you arrive______ the cinema? A. at B. in C. / 17. Mother bought two ______ for me. A. shoes B. pair of shoes C. pairs of shoes 18. I don’t have _____ money to buy a ticket to London. A. some B. many C. enough 19.Beef is usually a _______ in a meal. A. soup B. main course C. desert. 20._______ lives in the palace. A. Queen B. Queens C.The Queen 二．阅读理解,判断正误。（共15 小题，每小题 2 分，共30 分。）
微生物学考试试题及答案
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09.液体培养基稀释培养测数法，取定量稀释菌液，经培养找出临界级数，可以间接测定 样品活菌数。(√) 10.共生固氮微生物，二种微生物必须紧密地生长在一起才能固定氨态氮，由固氮的共生 菌进行分子态氮的还原作用。(√) 一．多项选择题（在每小题的备选答案中选出二至五个答案，并将正确的答案填在题干的括号内，正确的答案未选全或有选错的，该小题无分，每小题2分，共20分） 11.放线菌是能进行光合作用的原核微生物，其细胞形态（A；B；C；） A.有细胞壁; B.由分支菌丝组成; C.无核仁; D.菌体无鞭毛; E.菌体中有芽孢。 12.支原体[Mycoplasma],介乎于细菌与立克次体之间的原核微生物,其特点是：（A；B；）A.有细胞壁;B.能人工培养； C.有核仁; D.有鞭毛； E.非细胞型微生物。 13.无机化合物的微生物转化中，其硝化作用包括：（C；D；E；） A.硝酸还原成亚硝酸; B.硝酸还原成NH 3；C.NH 3转化成亚硝酸;D.铵盐转化成亚硝酸； E.亚硝酸盐转化成硝酸盐。 14.单细胞微生物一次培养生长曲线中，其对数生长期的特点：（A；D; E；）
印刷报价公式
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合同法试题及答案解析
一、单选题 第1题 某开发公司与某科研单位，订立了技术开发合同，合同约定，开发经费为10万元，违约金为开发经费的10％，后开发公司因故违约，给科研单位造成1．2万元的实际损失，问开发公司应支付给科研单位（）损失费。 A 4万元 B 5万元 C 14万元 D 1．2万元 【正确答案】：D 【答案解析】 考点：违约责任的承担方式 解析：参见《合同法》第114条。 第2题 约定的违约金过分高于造成的损失的，当事人可以（） A 不得减少支付违约金 B 适当减少支付违约金 C 请求法院予以适当减少 D 拒绝支付违约金 【正确答案】：C 【答案解析】 考点：违约金过分高的处理 解析：合同法第114条规定：约定的违约金过分高于造成的损失的，当事人可以请求人民法院或者仲裁机构予以适当减少。 第3题 （）不是承担违约责任的方式。 A 价款 B 赔偿金 C 继续履行 D 违约金 【正确答案】：A 【答案解析】 考点：违约责任的承担方式 解析：合同法第107条规定：当事人一方不履行合同义务或者履行合同义务不符合约定的，应当承担继续履行、采取补救措施或者赔偿损失等违约责任。本题中BCD均属违约责任的承担方式，应选A。
第4题 甲与乙订立了一份苹果购销合同，约定：甲向乙交付20万公斤苹果，货款为40万元，乙向甲支付定金4万元；如任何一方不履行合同应支付违约金6万元。甲因将苹果卖与丙而无法向乙交付苹果，乙提出的如下诉讼请求中，既能最大限度保护自己的利益，又能获得法院支持的诉讼请求是什么？（） A 请求甲双倍返还定金8万元 B 请求甲双倍返还定金8万元，同时请求甲支付违约金6万元 C 请求甲支付违约金6万元，同时请求返还支付的定金4万元 D 请求甲支付违约金6万元 【正确答案】：C 【答案解析】 考点：违约责任的承担方式 解析：《合同法》第116条：“当事人既约定违约金依据116条的规定，违约金和定金条款只能选择适用其一，因此要判断选择哪一个条款对乙最为有利，由题中所述可知，适用违约金条款更为有利，乙可以得到6万元的赔偿；其次，选择了违约金条款，就排除了定金条款的适用，因而依据115条的规定，定金应该返还。总之，甲应向乙支付违约金6万元，同时向乙返还定金4万元。本题的四个选项很具有迷惑性，考生要保持清醒的头脑。 第5题 根据我国合同法的规定，当事人一方不履行合同义务或者履行义务不符合约定的，应当承担继续履行、采取补救措施或者赔偿损失等违约责任。该规定采用的民事责任归责原则是什么？（） A 过错责任原则 B 过错推定原则 C 公平责任原则 D 无过错责任原则 【正确答案】：D 【答案解析】 考点：违约责任的归责原则 解析：《合同法》第107条：“当事人一方不履行合同义务或者履行合同义务不符合约定的，应当承担继续履行、采取补救措施或者赔偿损失等违约责任。”对于违约责任的归责原则目前存在争议，通说认为是无过错责任原则。所谓无过错责任原则是指不以过错作为违约责任的构成要件。而过错责任原则和过错推定原则都是以过错作为违约责任的构成要件，只是在过错推定原则下实行举证责任倒置。笔者倾向于过错推定原则，但是考生在考试中要以通说为标准做答。 第6题 甲厂与乙仓储保管方签订了一份仓储合同，约定甲厂将一批电机储存在乙方，存期半个月，期满后由乙方负责将电机发运至丙厂。储存期满后，乙方由于疏忽，未按期将该批电机运至丙厂，造成甲厂逾期交货，向丙厂支付了违约金8万元。根据有关法律规定，下面的正确表述是哪项？（）
(完整word)全国近五年高考英语真题—语法填空
2015～2011年各省市高考题 Passage 1(2015·新课标全国Ⅰ) 阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 Yangshuo，China It was raining lightly when I 1 (arrive) in Yangshuo just before dawn.But I didn't care.A few hours 2 ，I'd been at home in Hong Kong，with 3 (it) choking smog.Here，the air was clean and fresh，even with the rain. I'd skipped nearby Guilin，a dream place for tourists seeking the limestone mountain tops and dark waters of the Li River 4 are pictured by artists in so many Chinese 5 (painting).Instead，I'd headed straight for Yangshuo.For those who fly to Guilin，it's only an hour away 6 car and offers all the scenery of the better－known city. Yangshuo 7 (be) really beautiful.A study of travelers 8 (conduct) by the website TripAdvisor names Yangshuo as one of the top 10 destinations in the world.And the town is fast becoming a popular weekend destination for people in Asia.Abercrombie & Kent，a travel company in Hong Kong，says it 9 (regular) arranges quick getaways here for people 10 (live) in Shanghai and Hong Kong. 【语篇导读】桂林山水甲天下，阳朔风光甲桂林。作者讲述了从香港去阳朔旅游时的所见。 1.解析考查动词的时态。主句谓语动词使用了过去进行时，根据语境此处要用一般过去时态。
微生物考试试题(附答案)
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印刷纸张报价公式
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合同法真题及答案
2018年10月高等教育自学考试全国统一命题考试 合同法试卷 (课程代码00230) 本试卷共6页。满分l00分。考试时间l50分钟。 考生答题注意事项： 1．本卷所有试题必须在答题卡上作答。答在试卷上无效，试卷空白处和背面均可作草稿纸。 2．第一部分为选择题。必须对应试卷上的题号使用2B铅笔将“答题卡”的相应代码涂黑。 3．第二部分为。必须注明大、小题号，使用0．5毫米黑色字迹签字笔作答。 4．合理安排答题空间，超出答题区域无效。 第一部分选择题 一、单项选择题：本大题共25小题。每小题l分。共25分。在每小题列出的备选项中 只有一项是符合题目要求的。请将其选出。 1．甲公司为某知名饮料生产商，为提高公司业绩，向各大超市、商场寄送了其生产的多种饮料的价目表。甲公司的行为属于 A．要约 B．承诺 C．要约邀请 D．新要约 2．甲乙双方经协商达成协议，双方法定代表人均在合同文本上签了字，但都未加盏公章或合同专用章。不久甲方开始分批交货，乙方收货后付款。后因货物质量问题发生争议，诉至法院。双方协议的效力是 A．协议无效 B．协议有效 C．合阏未成立 D．合同已成立未生效 3．下列合同条款中无效的是 A．无处分权的人处分他人财产 B．由限制民事行为能力人订立的 C．格式条款排除对方主要权利的 D．约定因过错造成对方财产损失免责的 4．张某欲将自己祖传的青铜牛变卖给李某，价款4万元，6月1日交付青铜牛，李某 10目内付款，并约定采用书面形式订立合同。6月1日，张某将青铜牛交给李某，后由于李某拒不履行付款义务，双方发生争执。张某主张李某应当支付款项，并承 担违约责任，而李某则认为双方没有按约定订立书面合同，合同未能成立，其愿返 还青铜牛，但不付款。以下说法正确的是 A．因双方未按约定订立书面合同，合同不能成立，李某有权不付款，但应返还青铜牛 B．虽然没有订立书面合同，但张某已交付青铜牛，李某也已接受，合同成立，李菜应付款
(完整版)近五年高考英语语法填空真题解析
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微生物历年考研真题及复习资料
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1．设计一个实验程序，以确保在对未知菌进行革兰氏染色时操作正确，结果 可靠。 2．设计一套从自然界筛选分离一株对聚氯联苯类农药降解能力高的菌株的 方案。 四、问答题（每题15分，共30分） 1．什么是营养缺陷型？如何从诱变菌株中筛选出营养缺陷型。 2．光合细菌有哪几类？细菌的光合作用与绿色植物的光合作用之间有什么 不同？ 2005年北京师范大学攻读硕士研究生入学考试试题 一、名词解释（每题3分，共45分） 1．半抗原2．表型3．病毒入胞4．病毒因子5．超敏反应6．反向末 端重复7．分段基因组8．富集培养9．干扰素 .感受态细胞11.核壳 12.类囊体13.免疫原性14．原养型15．微生物传感器 二、简要回答题（每题5分，共45分） 1．是微生物的遗传物质吗？为什么？
印刷工价计算公式
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=封面纸张总数×腹膜单价 =腹膜费 局部UV：封面纸张总数×局部UV单价=局部UV费 烫金：册数×烫金单价=烫金费 压凹凸：册数×压凹凸单价=压凹凸费 模切：四色印刷×模切单价+模切板费=模切费 装订：印张数（单本书）×册数×每印张装订单价=装订总费用 合计：各种费用合计后÷册数=单本书价格 单本书价格÷印张=单印张价格 注：（1）印张=单本书总页码÷开本 （2）单张纸面积=印刷所用纸张（长×宽）如：0.787×0.546 工厂常用纸规格为：880×630 787×550 787×546 （3）色数是印刷正反面共用几色（公司所印书大部分为正反四色）（4）册数是单本书共印多少册 (5)印刷工价：单色为7---9元/色令 双色为9---12元/色令 四色为18---25元/色令 （6）腹膜工价：对开为：0.3元/张 四开为：0.15---0.2元/张 （7）局部UV工价：对开为：0.3元/张 四开为：0.2元/张 （8）单张纸印刷个数计算方法为：
合同法试题一答案
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8. 合同终止以后当事人应当遵循保密和忠实等义务，此种义务在学术上称为后契约义 务。此种义务的依据是（） A.自愿原则 B.合法原则 C.诚实信用原则 D.协商原则 9. 某企业在其格式劳动合同中约定：员工在雇佣工作期间的伤残、患病、死亡，企业 概不负责。如果员工已在该合同上签字，该合同条款（） A. 无效 B. 是当事人真实意思的表示，对当事人双方有效 C. 不一定有效 D. 只对一方当事人有效 10. 当事人采用合同书形式订立合同的，自（） A. 双方当事人制作合同书时合同成立 B. 双方当事人表示受合同约束时合同成立 C. 双方当事人签字或者盖章时合同成立 D. 双方当事人达成一致意见时合同成立 二、多项选择题（每小题3分，共10分。在每小题的五个备选答案 中，选出二个以上的正确答案，将其序号填在括号内。正确答案 未选全或选错的。该小题不得分） 1 ?依照我国有关法律及行政法规的规定，须经审批机构审批方为生效的合同 有（）。 A ?中外合资经营企业合同B。中外合作经营企业合同 C ?涉外贸易买卖合同 D ?技术引进合同 E ?对外合作开采海洋石油资源合同 2 ?下列情况，属无效合同的有（）。 A ?因欺诈而订立的合同 B ?因胁迫而订立的合同 C .损害国家利益的合同 D .无行为能力人订立的合同 E. 当事人以合法形式掩盖非法目的合同 3 .在权利质押中可以质押的权利有（＞。
2020江苏五年制专转本英语统考真题
江苏省2018年五年一贯制高职“专转本”考试 英语统考试卷 （90分钟） I. Reading Comprehension Passage One The TV play Zheng He is broadcasted on CCTV and the great Chinese traveler comes gradually back to us. It reminds us of a lot of excitement. Zheng He, the Columbus of the east, was an amazing man. He was born in 1371 and, 11 years later, was caught by the army of a rich young man called Zhu Di and made to word for him. Over time the rich man saw that Zheng He was very clever and strong and they became close friends. In 1403, Zhu Di was made the king of China and asked Zheng He to join his new government. The King wanted to learn more about the world and show other countries his power. He ordered many new ships to be built and made Zheng He the leader. Between 1405 and 1433, he led seven sea ships to different parts of the world. He certainly traveled to India, Africa and the Middle East. Some people insist that his ships may have even reached South Africa and Australia. Each trip lasted between two and four years and it is believed he sailed more than 50,000 kilometers during his travels. With 28,000 men and over 300 ships, such as boats for food, water and even soldiers’ horses, Zheng He led a fleet whose size would not be equaled by Europeans for over 500 years. On these trips, he brought with him many Chinese goods like silk and medicine to give to the foreign kings or to sell for local goods. He returned from each trip with boats filled with expensive things such as gold and jewellery, foreign guests and strange animals like a giraffe. It is a pity that we may never learn everything about Zheng He’s travels. After he died in 1433, the new king, who thought these trips were unlucky and cost too much, had them stopped and he burned almost all the books about Zheng He’s travels. It is onl y in the last 50 years, that historians have carefully studied the adventures of the great Zheng He. 1. Why did the Chinese King order Zheng He to sail to many different countries? A. To bring new countries under the control of China. B. To show the world his power. C. To receive gifts from the kings of other countries. D. To discover unusual animals. 2. What do we know about Zheng He from the passage? A. He sailed across the world. B. Each of the trips lasted one year. C. He died at the age of 62. D. He was a successful soldier. 3. Which of the following did Zheng He bring with him from China? A. Gold B. Jewellery C. Medicine D. Giraffes 4. What happened after Zheng He died? A. He was forgotten forever. B. His ships were all destroyed. C. The new king wrote a book about him D. Sea trips to foreign countries were stopped. 5. In what order did the following happen? a. Zhu Di become the King. b. Zheng He was caught by soldiers. c. The books about Zheng He were all burne d.