如图所示用力�下压长棒撬起一块大石头 对长棒的力是动力动力的作用效果是使长棒 针转动.图中若用竖直�下的力f压长棒时大石头未撬动.可把 Template




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tomski如图所示用力�下压长棒撬起一块大石头 对长棒的力是动力动力的作用效果是使长棒 针转动.图中若用竖直�下的力f压长棒时大石头未撬动.可把 coloring