对于反应：N2O4（g）
2NO2（g）在温度一定时，平衡体系中NO2的体积分数φ（NO2）随压强的变化情况如图所示（实线上的对应压强下的平衡点），下列说法正确的是
A.A、C两点的正反应速率的关系为v（A）＞v（C）
B.A、B、C、D、E各状态中，v（正）＜v（逆）的是状态E
C.维持P1不变，E→A所需时间为x；维持P2不变，D→C所需时间为y，则：x＜y
D.使E状态从水平方向到达C状态后，再沿平衡曲线到达A状态，从理论上讲可选用的条件是从P1突然加压到P2，再由P2无限缓慢降压到P1
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