题目内容

标准机床主轴端部有的锥孔。

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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

Our products_ from quite cheap to very expensive.

A. rang
B. vary
C. choose
D. range

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