Which of the following refrigerant conversions is not considered a drop-in?

a. HFC-134a for HCFC-22
b. HCFC-409A for CFC-12
c. HFC-407C for HCFC-22
d. HCFC-123 for CFC-11


a

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_______________ is the study of the movement of heat and energy within the universe

Fill in the blank(s) with the appropriate word(s).

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