用如图所示�轮组提升重物.人用50n的拉力f15s内使重为90n的物体匀速上升了3m.不计绳重和�擦求1动�轮的重.2人拉绳子 Template




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tomski用如图所示�轮组提升重物.人用50n的拉力f15s内使重为90n的物体匀速上升了3m.不计绳重和�擦求1动�轮的重.2人拉绳子 coloring