题目内容
已知2SO 2+O 2 
2SO 3; △ H＝-92.6 kJ·mol -1，当反应达到平衡时，下列措施：①降低温度；②减小压强；③用V 2O 5作催化剂；④增大O 2的浓度；⑤增大SO 2的浓度；⑥恒压通入He气，能提高SO 2转化率的是
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