Which of the followowing does paper burn in?A.CO2 B.N2 C.O2 D.H2

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Whichofthefollowowingdoespaperburnin?A.CO2B.N2C.O2D.H2Whichofthefollowowingdoespaperburnin?A.CO2B.N2

Which of the followowing does paper burn in?A.CO2 B.N2 C.O2 D.H2
Which of the followowing does paper burn in?A.CO2 B.N2 C.O2 D.H2

Which of the followowing does paper burn in?A.CO2 B.N2 C.O2 D.H2
纸能下面哪一个中燃烧?
C.O2 氧气.

C.O2