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干电池提供的电能是由 (a) (能量)转化来的
电能在生活中常用单位为( )
W
J
kW· h
A
电能的国际单位是( )
单位换算: 1 kW· h= (a) J
认识电表:以下哪个是机械式的电表?
图中电能表的读数为: (a) 千瓦时(答案不用带单位)
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