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如图1-2-13所示.将质量为m 1 和m 2 的物体分置于质量为M的物体两侧,均处于静止状态.且m 1 >m 2 ,α<β,下述说法不正确的是:[ ] A.m 1 对M的正压力一定大于m 2 对M的正