Low-temperature cascade system use refrigerants with ______ boiling temperature and high temperature cascade system use refrigerants with _________ boiling temperature.
A. low, high
B. high, low
C. low, low
D. high, high
Answer:A
Low-temperature cascade system use refrigerants with ______ boiling temperature and high temperature cascade system use refrigerants with _________ boiling temperature.
A. low, high B. high, low C. low, low D. high, high