在一定条件下，可逆反应A（g）+3B（g） 4C（g）达到平衡时，下列叙

在一定条件下，可逆反应A（g）+3B（g） 4C（g）达到平衡时，下列叙述正确的是（）

A．此时反应物B全部转化成了生成物

B．单位时间内生成n molA，同时生成3n mol B

C．若改变条件，A、B、C的浓度有可能再变化

D．A、B、C的分子数比为1:3:4

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