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【单选题】
点的合成运动中( )
A.
相对运动是指动参考系相对于定参考系的运动
B.
牵连运动是指动点相对动参考系的运动
C.
牵连速度和牵连加速度是指动参考系对定参考系的速度和加速度
D.
牵连速度和牵连加速度是该瞬时动系上与动点重合的点的速度和加速度
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