下列叙述中正确的是 a合外力对物体做功为零的过程中物体的机械能一定守恒 b.物体在合外力作用下做变速运动则物体动能一定变化 C Template




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tomski下列叙述中正确的是 a合外力对物体做功为零的过程中物体的机械能一定守恒 b.物体在合外力作用下做变速运动则物体动能一定变化 coloring