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Question:

A refrigerant that can be used as a direct service “drop-in” substitute for R-12 in a small appliance is ______.

A None of these
Explaination

There is no “drop-in” replacement for R-12. Although R-134a is considered a preferred replacement refrigerant, it is not a “drop-in” which is a term that implies that you do not have to change compressor lubricant, expansion valve etc.