试题与答案

下列说法正确的是() A.流体与固体在力学特性上最本质的区别在于二者分子间间距不同。

题型:单项选择题

题目:

下列说法正确的是()

A.流体与固体在力学特性上最本质的区别在于二者分子间间距不同。

B.可以证明,当马赫数小于0.3时,气体的压缩性影响可以忽略不计。

C.流体作用在平板上的摩擦力与平板面积成反比

D.拉格朗日法不是追综流体微团。而是看流动空间各点在不同瞬时t的流动参数分布情况。从而获得整个流场的运动规律。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析: 本题考查安全行车间隔里程的计算公式。安全行车间隔里程=报告期营运总里程/同期行车事故次数=120/3=40万公里(事故次数是指“一般”以上的责任事故)。

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题型:阅读理解

阅读理解。

    A great French writer has said that we should help everyone as much as we can because we often need

help ourselves. The small even help the great.About this, he told the following story.

    An ant was drinking at a small river and fell in. She tried her best to reach the side, but she couldn't move

at all. The poor ant got too tired but was still doing her best when a big bird saw her. With a pity, the bird

threw a piece of wood. With it the ant reached the bank again. While she was resting and drying herself in

grass she heard a man coming up. He was walking without shoes on his feet and carrying a gun in his hand.

As son as he saw the bird, he wished to kill her, and he would certainly do soon, but the ant bit him in one of his

feet and at that moment the bird flew away at once. It was an animal mucher weaker and smaller than the bird

herself that had saved her life.

1. Acorrding to the French writer, we often need help from others, so we should ______. [ ]

A. get as much help as we can

B. first need to help ourselves

C. help others as much as we can

D. help the people who may be useful to us

2. Why could the bird fly away at once? Because ______. [ ]

A. the bird could fly very fast

B. the man hurt his feet himself

C. the man didn't want to kill her

D. the ant bit the man in one of his feet

3. An ant fell in the river and could not reach the side because ______. [ ]

A. she didn't try to

B. she wanted to swim in the river

C. she didn't cry for help.

D. she wasn't able to move in the water

4. The writer writers this story to show ______.[ ]

A. how brave the bird is

B. how clever the ant is

C. how an ant saved a bird

D. even the small can help the great

5. The title of this story can be " ______". [ ]

A. The ant

B. Pity

C. Help

D. The bird

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