2．如图所示的曲线为运动�抛出的铅球运动轨迹abc为曲线上的三点关于铅球在b点的速度方�说法正确的是 A．为ab的方� B Sketch Coloring Page

2．如图所示的曲线为运动�抛出的铅球运动轨迹abc为曲线上的三点关于铅球在b点的速度方�说法正确的是 A．为ab的方� B Template

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