下列说法正确的是()A．物体受到恒力的冲量也可能做曲线运动B

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下列说法正确的是( )

A．物体受到恒力的冲量也可能做曲线运动

B．动能不变，物体的动量一定不变

C．动量为零时，物体一定处于平衡状态

D．物体所受合外力大小不变时，其动量大小一定要发生改变

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