用相同的两个�轮组成三种装置一个定�轮一个动�轮�轮组.用这三种装置先后将一重力为g的物体提高h米其中机械效率最大的是 A.定�轮 Template




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tomski用相同的两个�轮组成三种装置一个定�轮一个动�轮�轮组.用这三种装置先后将一重力为g的物体提高h米其中机械效率最大的是 a.定�轮 coloring