In the presence of an open flame or hot surfaces, chlorinated flourocarbon refrigerants decomposes and form .A.petroleum crystalsB.phosgene gasC.water vaporD.carbon monoxide

题目内容（请给出正确答案）

In the presence of an open flame or hot surfaces, chlorinated flourocarbon refrigerants decomposes and form .

A.petroleum crystals

B.phosgene gas

C.water vapor

D.carbon monoxide

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