题目内容
将H 2(g)和Br 2(g)充入恒容密闭容器，恒温下发生反应H 2(g)+Br 2(g) 
2 HBr(g) ΔH＜0平衡时Br 2(g)的转化率为a；若初始条件相同，绝热下进行上述反应，平衡时Br 2(g)的转化率为b。a与b的关系是( )
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