如图所示为运动�抛出的铅球运动轨迹abc为曲线上的三点关于铅球在b点的速度方�下列说法正确的是 A.为ab的方� b.为bc的方� Template




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tomski如图所示为运动�抛出的铅球运动轨迹abc为曲线上的三点关于铅球在b点的速度方�下列说法正确的是 a.为ab的方� b.为bc的方� coloring