关于物体处于平衡状态的条件，下列说法中正确的是（A）物体的速

关于物体处于平衡状态的条件，下列说法中正确的是

（A）物体的速度为零（B）物体的速度大小不变

（C）物体的速度方向不变（D）物体所受合力为零

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关于物体处于平衡状态的条件，下列说法中正确的是 （A）物体的速

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关于物体处于平衡状态的条件，下列说法中正确的是（A）物体的速