题目内容

通常主轴准停机构有2种方式,即与。

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标准机床主轴端部有的锥孔。

数控机床对主传动系统的要求:、、宽调速。

One of the best_ of the 2Oth century is the mobile phone.

A. invents
B. inventions
C. inventors
D. invests

The_news is that China is holding the biggest trade fair in the world in 2015.

A. latest
B. ultimate
C. final
D. last

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