题目内容

直流电机电枢导体中的电势和电流是()

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【C14】

A. ready
B. sure
C. easy
D. close

屋面保温层厚度的允许偏差,对于整体现浇保温材料为().
A﹒-5%~+5%
B﹒-5%~+10%
C﹒+5%~-10%
D﹒-10%~+10%

【C16】

A. advantage
B. problem
C. issue
D. concern

You should NOT use a power tool if ().

A. It has a three-prong plug
B. The insulation of the power wires is worn
C. Hand tools can be used instead
D. The power source is alternating current

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