14.如图8所示用恒力f通过光�的定�轮将静止于水平面上的物体从位置a拉到位置b物体可视为质点定�轮距水平面高为h物体在位置ab时 Template




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tomski14.如图8所示用恒力f通过光�的定�轮将静止于水平面上的物体从位置a拉到位置b物体可视为质点定�轮距水平面高为h物体在位置ab时 coloring