What type of refrigerants are normally used in CO2 cascade refrigeration systems?

A) CO2 refrigerant in the high-temperature system and HFC refrigerant in the low-temperature system
B) HFC refrigerant mixed with CO2 in both systems
C) HFC refrigerant in the high-temperature system and CO2 in the low-temperature system
D) CO2 refrigerant in both the high- and low-temperature systems


C

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