关于功率,下列说法正确的是: A.功率说明做功多少的物理量   

关于功率,下列说法正确的是:

A.功率说明做功多少的物理量           B.功率说明力做功快慢的物理量

C.做功时间越长,功率一定小           D.力做功越多,功率一定大

答案

B


解析:

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