如图所示是家庭常用的电能表,下列说法正确的是( ) A.这块电能表

如图所示是家庭常用的电能表,下列说法正确的是(  )

A.这块电能表正常工作的电压为220 V     

B“kW·h”是电功率的单位

C.利用电能表和秒表不能测出用电器的电功率     

D.图中电能表指示的读数为63 280 J

 

答案

A

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