大气正常组成为

A、O[img=~/QImg/2013-10-14-11-46-19/image002.jpg]、CO[img=~/QImg/2013-10-14-11-46-19/image002.jpg]、水蒸气
B、O[img=~/QImg/2013-10-14-11-46-19/image002.jpg]和稀有气体
C、SO[img=~/QImg/2013-10-14-11-46-19/image002.jpg]、CO、NO[img=~/QImg/2013-10-14-11-46-19/image001.jpg]
D、氦、氖、氩、氪、氙
E、N[img=~/QImg/2013-10-14-11-46-19/image002.jpg]、O[img=~/QImg/2013-10-14-11-46-19/image002.jpg]、氩气、CO[img=~/QImg/2013-10-14-11-46-19/image002.jpg]及微量稀有气体