人用绳子通过定�轮拉物体aa穿在光�的竖直杆上当人竖直�下拉绳使物体a匀速上升在a匀速上升的过程中则绳对a的拉力将变大人拉绳的速度将 Template




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tomski人用绳子通过定�轮拉物体aa穿在光�的竖直杆上当人竖直�下拉绳使物体a匀速上升在a匀速上升的过程中则绳对a的拉力将变大人拉绳的速度将 coloring