空气的净化问题正日益受到人们的关注。下列各组中成分均属于空气

空气的净化问题正日益受到人们的关注。下列各组中成分均属于空气污染物的一组是   

A. SO2  CO   NO2                 B. CO2   HCl  N2

C. CH4    CO2  H2                  C. SO2      N2    O2

答案

A

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