一个重20n的物体受到20n竖直�上的拉力时该物体 A.一定处于静止状态 b一定处于匀速上升状态 c一定处于匀速下降状态 d以上三种情况都 Template




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tomski一个重20n的物体受到20n竖直�上的拉力时该物体 a.一定处于静止状态 b一定处于匀速上升状态 coloring