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【单选题】
体积相同的甲、个容器，相同温度下甲充入1gSO 2 （g） 和1g O 2 （g）,入2g SO 2 （g）和2g O 2 （g），反应2SO 2 （g）+O 2 (g) 2SO 3 (g)达平衡后，甲中SO 2 的转化率为m，SO 2 的转化率为n，则 m和n的关系为A.
m =' n'
B.
m > n
C.
m < n
D.
无法确定
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