如图所示用12n的拉力沿竖直方�匀速拉起重为2n的物体物体上升01m所用时间为4s.1此过程中拉力的功率为 W动�轮的机械效率为 Template




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tomski如图所示用12n的拉力沿竖直方�匀速拉起重为2n的物体物体上升01m所用时间为4s.1此过程中拉力的功率为 w动�轮的机械效率为 coloring