【单选题】
【单选】 在工作中 ,电能的常用单位符号是 ___。
A. W
B. kW
C. kW/h
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答案
C
解析
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【单选题】
【单选】 关于 380/220V 市电系统 ,___ 说法是正确的。
A. 220V 是相电压 ,380V 是线电压
B. 220V 是线电压 ,380V 是相电压
C. 220V 和 380V 都是相电压
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