问题 问答题 简答题

“严禁在同一根等直径轴上安装具有相同过盈量的几个零件”,为什么?

答案

参考答案:

不仅使嵌装和拆卸困难,而且先装的零件对轴已产生了挤压了全部的过盈量使“等径轴”尺寸发生变化,致使后装的零件得不到足够的过盈量、联接强度难以保证

阅读理解

阅读理解。

    An old scientist recently made several tests with different animals to find out which was cleverer than

other animals.

    In one test the old scientist put a monkey in a room where there were several boxes. Some boxes were

inside other boxes. One small box had some food in it. The scientist wanted to watch the monkey and to

find out how long it would take the monkey to find the food. The scientist left the room. He waited a few

minutes outside the door. Then he got down on his knees (膝盖) and put his eyes to the keyhole. What did

he see? To his surprise, he found himself looking into the eye of the monkey. The monkey was on the other

side of the door and looked at the scientist through the keyhole.

1. The scientist did the test to see ______. [ ]

A. if the monkey would steal (偷) the food

B. if the monkey would look for the food

C. if the monkey was cleverer than other animals

D. if some boxes were inside other boxes

2. In one test the scientist put a monkey ______. [ ]

A. into a small box

B. into several small boxes

C. into a box where there was some food

D. in a room

3. After the scientist left the room, the monkey ______. [ ]

A. began to eat food

B. began to look for food

C. looked at the scientist through the keyhole

D. came into the boxes one after another

4. The scientist ______. [ ]

A. got down on his knees and waited outside the door

B. got down on his knees and heard with his ears

C. left the room for a long time

D. looked at the monkey through the keyhole with his eyes

5. To the scientist's surprise ______. [ ]

A. the monkey got down on its knees

B. the monkey came out of the room

C. the monkey looked at the scientist through the window

D. the monkey put its eye to the keyhole

单项选择题