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如图所示,O为杠杆OA支点.当物体甲挂在动滑轮挂钩上在空中静止,物体乙挂在B点时,杠杆OA保持水平平衡,A端受到竖直向上的拉力为F1.已知动滑轮重G0=100N、物体乙重G乙=600N、OB:OA=...
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