挑战习题
1/5单选题
难度:

1.

如图所示,电磁继电器能通过低压控制电路间接地控制高压工作电路. 下列说法正确的是(  )


A

连有电动机的电路是低压控制电路

B

电磁继电器实际上是一个由电磁铁控制电路通断的开关

C

利用电磁继电器主要是为了节约用电

D

利用电磁继电器主要是为了操作方便

提示1:
PHA+5o6M5o+h55S156OB57un55S15Zmo55qE57uT5p6E5ZKM5Y6f55CGPC9wPg==
提示2:
PHA+5Yip55So55S156OB6ZOB5p2l5o6n5Yi25bel5L2c55S16Lev6YCa5patPC9wPg==
提示3:
PHA+5Li76KaB6YOo5Lu25Li65LiA5Liq55S156OB6ZOBPC9wPg==
正确答案:Qg==
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