某同学用如图所示的装置做验证动量守恒定律实验.先让a球从斜槽轨道上某固定点由静止开始滚下在水平地面上的记录纸上留下压痕重复10次再把同样 Template




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tomski某同学用如图所示的装置做验证动量守恒定律实验.先让a球从斜槽轨道上某固定点由静止开始滚下在水平地面上的记录纸上留下压痕重复10次再把同样 coloring