两个极易导热的密闭容器a和b，容器a体积恒定，容器b体积可变，在温度、压强、体积相同条件下往a和b中分别通入等量NO 2，起始条件相同.发生反应：2NO 2(g) 
N 2O 4(g)，以下正确的是：
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