如图所示小明用相同的�轮组成不同的�轮组忽略绳重及�擦分别将同一物体匀速提高到相同高度所用的拉力分别为f1f2绳子自由端移动的距离 Template




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tomski如图所示小明用相同的�轮组成不同的�轮组忽略绳重及�擦分别将同一物体匀速提高到相同高度所用的拉力分别为f1f2绳子自由端移动的距离 coloring