单选题Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is （）.Astored at temperatures below 60 degrees FahrenheitBcharged into a system having copper fittingsCallowed to mix with compressor oilDexposed to an open flame or hot surface
单选题
Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is （）.
A
stored at temperatures below 60 degrees Fahrenheit
B
charged into a system having copper fittings
C
allowed to mix with compressor oil
D
exposed to an open flame or hot surface
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