题目内容

提高传动链传动精度的措施有()。

A. 尽量缩短传动链,减少误差源数
B. 采用降速传动
C. 提高传动元件的制造精度和装夹精度,减少误差源
D. 采用传动误差补偿装置

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减小工艺系统受力变形的途径有()。

A. 提高工艺系统中零件间的配合表面质量,以提高接触刚度。
B. 设置辅助支承提高部件刚度。
C. 缩短切削力作用点和支承点的距离,以提高工件的刚度。
D. 采用合适的装夹方式

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A. 机床本身的制造
B. 机床的安装
C. 机床磨损

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