问题 填空题

今年“十•一”期间,小明一家三口自驾车外出旅游.她知道汽车是常见的交通工具,经过观察和思考汽车包含着很多物理知识.请你用学过的物理知识简要回答下列问题:

①汽车轮胎表面做有花纹,其目的是______;

②载重汽车的车轮比小汽车的多而且大,其目的是______;

③小车司机和乘客要系好安全带,是为了防止______带来的危害.

答案

(1)汽车轮胎表面做有花纹,其目的是为了在压力一定时,增大接触面粗糙程度来增大摩擦力,防止打滑.

(2)载重汽车的车轮比小汽车的多而且宽,其目的是为了在压力一定时,增大受力面积来减小压强,保护路基.

(3)小车司机和乘客要系好安全带,是为了防止紧急刹车时,司机和乘客由于惯性要保持原来的运动状态,冲出车外,避免发生危险.

故答案为(1)增大摩擦;(2)减小压强;(3)惯性.

单项选择题
阅读理解

阅读理解。

     Decision-making can be extremely difficult. Decision-making styles are significantly different. in different

cultures.

     In any approach to a problem and in any negotiations, the Western world turns to the "I to you" approach

while Japan, the "you to you" approach. The former means both sides present their arguments openly from

their own point of view. Naturally, often comes a confrontation (冲突) situation, which Westerners are very

skillful in dealing with. The latter is based on each side trying to understand the other person's point of view.

Thus, the direction of the meeting is a mutual (相互的) attempt to reduce confrontation and achieve harmony.

     Besides, Western decision-making goes mostly from top management (管理人员) and often does not

consult middle management or the worker. However, in Japan great consideration is given to the thoughts and

opinions of everyone at all levels. Based on "bottom-up direction", ideas can be created at the lowest levels,

travel upward through an organization and have an effect on the final decision.

     Difference in decision-making also comes from different communication styles. The Japanese business

person works to achieve harmony, even if the deal falls through, and will spend whatever time is necessary to

determine a "you to you" approach, communicating personal views only indirectly. They put a thorough job

above the Western deadline approach. So the Japanese are thorough in their meetings. Thus Americans are

often annoyed by the many meetings in many Japanese businesses. But where the American is pressing for a

specific decision, the Japanese is trying to think up a rather broad direction.

     On the other hand, once a given agreement is made, it is the Japanese who sometimes wonder at the slow

pace in which Westerners carry out the decision. The Japanese are eager to move forward and Westerners,

perhaps, lag (落后) behind as they take the time for in-depth planning.

1. A Japanese business bases its decision _____.

A. on top-down direction

B. on nothing but its workers' views

C. on bottom-up direction

D. only on its top leaders' opinions

2. The text mainly tells us that Japan and the Western world _____.

A. face great difficulty in making decisions

B. are different in decision-making styles

C. have all members contribute to a decision

D. have two approaches:"I to you" and "you to I"

3. Which of the following is TRUE of the Westerners?

A. They carry out the decision once it is made.

B. There are many meetings in their businesses.

C. They work to achieve harmony in doing business.

D. They are good at handling confrontation situation.

4. The author's attitude towards Japanese decision-making is _____.

A. positive

B. critical (批评的)

C. negative

D. casual (无所谓的)