潜油电机功率受（）限制。A.电压 B.电流 C.电机轴 D.功率因素_爱下问搜题

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问题单项选择题

潜油电机功率受（）限制。

A.电压

B.电流

C.电机轴

D.功率因素

答案

参考答案：C

选择题

I ______ by a dog once and I ______ of dogs ever since.

A. was bitten; have been afraid
B. have been bitten; was afraid
C. was bitten; was afraid
D. have been bitten; have been afraid

填空题

一般金属材料都有（）的现象。