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对在密闭容器中进行的可逆反应:4NH3(g)+5O2 4NO(g)+6H2O(g),下列叙述正确的是

A:反应达到平衡时,若两种反应物的转化率相等,则起始投入的n(NH3)∶n(O2)=1∶1

B:反应达到平衡后,再向体系中充入O2,将提高NH3的转化率

C:反应达到平衡时,若向体系中充入稀有气体,速率增大

D:当v正(NH3):v正(NO)=1∶1时,说明该化学反应已经达到平衡

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B

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