When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（） A:CO2 B:Methyl chloride C:R-22 D:Sulphur dioxide

When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）
A:CO₂
B:Methyl chloride
C:R-22
D:Sulphur dioxide

出自：海船船员证

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