如图所示小王用两个相同的�轮组分别将重力不同的两个物体匀速提高到相同高度其中g1>g2则所用的拉力f1>f2其机械效率η1>η2所 Template




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tomski如图所示小王用两个相同的�轮组分别将重力不同的两个物体匀速提高到相同高度其中g1>g2则所用的拉力f1>f2其机械效率η1>η2所 coloring