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8.游乐场中的一滑梯如图3所示。小朋友从轨道顶端由静止开始下滑,沿水平轨道滑动
了一段距离后停下来,则
A.下滑过程中支持力对小朋友做功
B.下滑过程中小朋友的重力势能增加
C.整个运动过程中小朋友的机械能守恒
D.在水平华东过程中摩擦力对小朋友做负功
D.塔里木河处于丰水季节
参考答案
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B |
A |
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