有一竖直放置两端封闭的长玻璃管管内为真空管内有一小球自某处自由下落落到玻璃管底部时与底部�生弹性碰撞.以后小球将在玻璃管内不停地上下 Template




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tomski有一竖直放置两端封闭的长玻璃管管内为真空管内有一小球自某处自由下落落到玻璃管底部时与底部�生弹性碰撞.以后小球将在玻璃管内不停地上下 coloring