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【单选题】
在静参考系中讨论运动的物体,以下几种说法中,哪些是正确的?
A.
惯性力是作用在运动物体上的作用力；（）
B.
惯性力是作用在使物体运动的其他物体上的反作用力；
C.
在运动物体上加上惯性力后，其主动力、约束力和惯性力组成一平衡力系，但物体并非处于平衡状态；
D.
在运动物体上加上惯性力后，其主动力、约束力和惯性力组成一平衡力系，物体处于平衡状态。
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