试题与答案

汽轮机、干燥机在运行时通蒸汽,温度比与之连接的发电机、鼓风机、电动机高,在对这类机组

题型:单项选择题

题目:

汽轮机、干燥机在运行时通蒸汽,温度比与之连接的发电机、鼓风机、电动机高,在对这类机组的联轴器装配定心时,应考虑的问题是( )。

A.应控制悬臂轴水平度的偏差方向

B.应控制轴线与机组中心线垂直度的方向

C.应控制安装偏差的方向,调整两轴心径向位移精度

D.应调整轴承的间隙、轴封等密封装置的间隙

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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题型:阅读理解

It was a village in India. The people were poor but they were happy. After all, their forefathers had lived in the same way for centuries.

Then one day, some visitors from the city arrived. They told the villagers there were some people elsewhere who liked to eat frog. However, they did not have enough frogs of their own, and so they wanted to buy frogs from other places.

This seemed like money for nothing. There were millions of frogs in the fields around, and they were useless to the villagers. What they had to do was to catch them. Agreement was reached, and the children were sent into the fields to catch frogs. Every week a truck arrived to collect the catch and hand over the money. The villagers were able to dream of a better future. But the dream didn’t last long.

The change was hardly noticed at first, but it seemed as if the crops weren’t doing so well. More worry was that the children fell ill more often, and there were more insects around lately. The villagers decided that they couldn’t just wait to see the crops failing and the children getting weak. They would have to use the money earned to buy pesticides (杀剂) and medicine. Soon there was no money left.

The people realized what was happening. It was the frog. They hadn’t been useless. They had been doing an important job--- eating insects. Now with so many frogs killed, the insects were increasing more rapidly. They were damaging the crops and spreading diseases.

Now, the people are still poor. But in the evenings they sit in the village square and listen to sounds of insects and frogs. These sounds of the night now have a much deeper meaning.

小题1:From Paragraph l, we learn that the villagers_______.

A.worked very hard for centuries

B.dreamed of having a better life

C.were poor but somewhat happy

D.lived a different life from their forefathers小题2:Why did the villagers agree to sell frogs?

A.The frogs were easy money.

B.They needed money to buy medicine.

C.They wanted to please the visitors.

D.The frogs made too much noise.小题3: What might be the cause of the children’s sickness?

A.The crops didn’t do well.

B.There were too many insects.

C.The visitors brought in diseases.

D.The pesticides were overused.小题4:What is meaning of the last sentence of the article?

A.Happiness comes from peaceful life in the country.

B.Money is important.

C.The harmony between man and nature is important.

D.Good old days will never be forgotten.

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