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______give us help is welcome.

A. Who ever
B. Whoever
C. No matter who
D. Those who

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防爆电机安装前须用( )V绝缘电阻表测量电机绕组的对地绝缘电阻。

A. 500
B. 1000
C. 2500
D. 1500

在斜二测轴测图中,取轴间角∠Y1O1Z1为135°,并取O1Y1轴的轴向变形系数为0.05。()

A. 对
B. 错

It is obvious that there are at least two vitamins, ______is soluble in fat; ______ is soluble in water

A. The one; the other
B. One; the other
C. One; another
D. One; the another

代理进口所需外汇原则上由( )解决。

A. 受托方
B. 委托方
C. 最终用户
D. 保险公司

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