一物体向上抛出后，所受空气阻力大小不变，从它被抛出到落回原地

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一物体向上抛出后，所受空气阻力大小不变，从它被抛出到落回原地的过程（）

A．上升时间大于下降时间

B．上升加速度大于下降加速度

C．上升阶段平均速度大于下降阶段平均速度

D．上升阶段平均速度小于下降阶段平均速度

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