如图所示轻质杠杆oa可绕o点转动在它的中点b处挂一重物g.在杠杆的a端施加一个最小的力f使杠杆平衡在图中画出力f的方�. 题目和参考 Template




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tomski如图所示轻质杠杆oa可绕o点转动在它的中点b处挂一重物g.在杠杆的a端施加一个最小的力f使杠杆平衡在图中画出力f的方�. 题目和参考 coloring