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【单选题】
将10g CO 2 和CO的混合气体，通过装有足量Na 2 O 2 的干燥管，反应后干燥管的总质量增加了5.6g，则原混合气体中CO 2 的质量分数为A.
32%
B.
44%
C.
56%
D.
88%
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