如图所示用力f拉杠杆的a点使它处在平衡状态.图中f1f2f3f4表示力f的四种不同方�其中能使杠杆保持平衡的最小拉力为af1b Template




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tomski如图所示用力f拉杠杆的a点使它处在平衡状态.图中f1f2f3f4表示力f的四种不同方�其中能使杠杆保持平衡的最小拉力为af1b coloring