处于平衡状态的杠杆如再加一个力f后杠杆仍处于平衡则力f A.一定在阻力一边b.一定在动力一边c.作用线通过支点d.无法判断 题目和 Template




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tomski处于平衡状态的杠杆如再加一个力f后杠杆仍处于平衡则力f a.一定在阻力一边b.一定在动力一边c.作用线通过支点d.无法判断 题目和 coloring