在动能和势能相互转化的过程中如果不考�空气阻力机械能的总量保持不变 教材说明1.滚�实验能直观地表现动能和势能的转化它的优点在于能量 Template




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tomski在动能和势能相互转化的过程中如果不考�空气阻力机械能的总量保持不变 教材说明1.滚�实验能直观地表现动能和势能的转化它的优点在于能量 coloring