题目内容

Whichofthefollowinggasesisnotgreenhousegases?

A. perfluorocarbons (PFCs)
B. CO₂
C. nitrogen gas (N₂)
D. hydrofluorocarbons (HFCs)

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Whichofthefollowinggasesisnotgreenhousegases?

A. perfluorocarbons (PFCs)
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D. CO₂

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