如图所示是利用杠杆撬起一质材均匀的球形石头的情景o是支点.请在图中画出石头的重力示意图以及重力和力f的力臂并分别用字母l1和l2表示.——青 Template




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tomski如图所示是利用杠杆撬起一质材均匀的球形石头的情景o是支点.请在图中画出石头的重力示意图以及重力和力f的力臂并分别用字母l1和l2表示.——青 coloring