單項選擇題

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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單項選擇題

A refrigeration system contaminated with moisture can be affected by （）.

A.acid formation
B.sludge formation
C.ice in the expansion valve
D.All of the above

單項選擇題

R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerantIt can, however, become highly toxic when （）.

A.superheated outside the system
B.in contact with an open flame
C.heated to the boiling point
D.All of the above