6.下列叙述正确的是 A.如果物体所受的合外力为零那么合外力对物体做的功一定为零 b.如果合外力对物体做功为零则合外力一定为零 C Template




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tomski6.下列叙述正确的是 a.如果物体所受的合外力为零那么合外力对物体做的功一定为零 b.如果合外力对物体做功为零则合外力一定为零 coloring