题目内容

直流电动机的检查试验项目有：绕组对机壳及绕组相互间绝缘电阻的测定；绕组在实际的冷状态下直流电阻的测定；( )试验；振动的测定等。

A. 短路
B. 空载
C. 机械
D. 转速

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The building is ______ that one.

A) 3 times higher
B) 3 times as high as
C) 3 times as higher as
D) 3 times high

Whether that is a good solution depends on______.

A) how you look at it
B) what you look at it
C) you look at it
D) that you look at it

并励绕组励磁绕组的电流密度可在( )的范围内选取。

A. 3～5A/mm²
B. 5～8A/mm²
C. 8～10A/mm²
D. 11～15A/mm²

独立操作训练以学员独立操作为主，指导者仅做( )。

A. 辅导与纠正
B. 指示与纠正
C. 辅导与检验
D. 指示与检验