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【单选题】
一定条件下在2L的密闭容器中充入2 mol SO 2 和2mol O 2 ，发生反应2SO 2 (g)+O 2 (g) 2SO 3 (g)，进行到4min时，测得n(SO 2 )=1.2 mol。下列说法正确的是 [     ]
A.
反应进行到2 min时，容器中n(SO 3 )可能为0.5 mol
B.
当v(SO 2 )：v(O 2 )：v(SO 3 )=2：1：2时该反应达平衡状态
C.
温度升高时正反应速率升高，逆反应速率降低
D.
4 min内氧气的平均反应速率为0.5mol·L -1 ·min -1
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