题目内容

机床误差的来源有()。

A. 机床本身的制造
B. 机床的安装
C. 机床磨损

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We back in the campsite now if you didn't lose your way.

A. are
B. were
C. will be
D. would be

no modern equipment and technology, human would not explore space and deep sea.

A. Were
B. Had there been
C. If there are
D. If there have been

If Mr. Zhongpresent, he would have offered any possible medical assistance to the people in need.

A. was
B. had been
C. is
D. has been

the morning bus, he would not have been late for the graduation ceremony.

A. Did he catch
B. Should be caught
C. Has he caught
D. Had he caught

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