如图所示轻质杆可绕0点自由转动在a端施加一个始终垂直于杠杆的作用力f使轻质杆从oa位置匀速转到oa′位置的过程中力f的大小将 A Template




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tomski如图所示轻质杆可绕0点自由转动在a端施加一个始终垂直于杠杆的作用力f使轻质杆从oa位置匀速转到oa′位置的过程中力f的大小将 a coloring