如图所示用两个�轮分别匀速提升ab两个物体拉细绳的力f大小相等在相同时间内物体上升的距离也相等绳重及�擦不计�轮的质量小于物体的 Template




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tomski如图所示用两个�轮分别匀速提升ab两个物体拉细绳的力f大小相等在相同时间内物体上升的距离也相等绳重及�擦不计�轮的质量小于物体的 coloring