What is a secondary refrigerant?
A) A secondary refrigerant adds extra cooling capacity to the primary refrigerant.
B) A secondary refrigerant is used to replace an older CFC or HCFC.
C) A secondary refrigerant absorbs heat through temperature change only.
D) A secondary refrigerant is used in the second stage of a staging system.
C
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Fill in the blank(s) with correct word
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