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问题

Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it


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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