问题 问答题

以卧式加工中心为例,试写出其几何精度检验的内容。(至少写出五项)

答案

参考答案:

1)X、Y、Z坐标轴的相互垂直度。 

2)工作台面的平行度。 

3)X、Z轴移动时工作台面的平行度。 

4)主轴回转轴线对工作台面的平行度。 

5)主轴在z轴方向移动的直线度。 

6)Z轴移动时工作台边界与定位基准面的平行度。 

7)主轴轴向及孔径跳动。 

8)回转工作台精度。(写出其中五项就给全分) 

阅读理解

What do you like? Different people like different things. Some people like loud music, other people don’t. They think it is too noisy. They like soft music. Many people like sports, but they do not like the same sports.

In some countries, cricket(板球) is a very popular sport. In others, it is not popular at all. No one plays it and few people watch it on TV. The World Cup is very popular. Millions of people watch the games on TV. Some people don’t like doing sports. They just like to watch other people playing.

Different people like different foods. Some people do not like meat. They eat most kinds of fruits and vegetables. Some people do not like potatoes and bread. They prefer rice or corn.

Not everyone like the same colors. Most people have a favorite color. Some people like bright colors. Others prefer pale colors. The world is an interesting place because we all like different things.

小题1:What’s the main idea of this passage?

A.People all like the same things.

B.Different people like the same things

C.People all like different sports

D.Different people like different things小题2:Which sentence is true?

A.Everyone likes sports

B.Not many people like sports

C.Most people don’t like sports.

D.Lots of people like sports小题3:How many people like to watch the World Cup on TV?

A.Few people

B.Hundreds of different people

C.Millions of people

D.No one at all小题4:What do people who don’t like meat(不喜欢吃肉的人) eat?

A.Mostly(主要) potatoes and bread

B.Mostly fruits and vegetables

C.Mostly rice and corn

D.Mostly potatoes and corns小题5:Which sentence is true?

A.Most people have a favorite color

B.No one likes bright colors.

C.Everyone likes bright colors

D.Few people prefer pale colors

填空题