如图所示用始终竖直�上的力f匀速拉动较长的杠杆使重为18n的物体缓慢升高01m拉力大小为8n拉力移动的距离为025m.该杠杆的机械 Template




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tomski如图所示用始终竖直�上的力f匀速拉动较长的杠杆使重为18n的物体缓慢升高01m拉力大小为8n拉力移动的距离为025m.该杠杆的机械 coloring