如图所示是斜�上抛出物体的运动轨迹c点是轨迹最高点ab是轨迹上等高的两个点.下列叙述中正确的是a.物体在c点的速度为零b.物体在a点的 Template




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tomski如图所示是斜�上抛出物体的运动轨迹c点是轨迹最高点ab是轨迹上等高的两个点.下列叙述中正确的是a.物体在c点的速度为零b.物体在a点的 coloring