所有接触面光�,球从斜劈高处静止�下,为什么系统机械能守恒?除了解释没有内能损失外能不能用力与功解释? 知乎 Template




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tomski所有接触面光�,球从斜劈高处静止�下,为什么系统机械能守恒?除了解释没有内能损失外能不能用力与功解释? 知乎 coloring