22.如图所示用定�轮和动�轮分别将质量相同的甲乙两物体匀速提升相同的高度不计绳重与�擦且动�轮重g动小于乙物体的物重g则所用的拉力 Template




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tomski22.如图所示用定�轮和动�轮分别将质量相同的甲乙两物体匀速提升相同的高度不计绳重与�擦且动�轮重g动小于乙物体的物重g则所用的拉力 coloring