30.如图所示用�轮组提起重g的物体绳子自由端拉力为f重 物以速度勘匀速上升不计�擦和绳重则 1�轮组的机械效率为 2 Template




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tomski30.如图所示用�轮组提起重g的物体绳子自由端拉力为f重 物以速度勘匀速上升不计�擦和绳重则 1�轮组的机械效率为 coloring