单项选择题
In the refrigeration compressor the temperature of the vapor is （） by compression.
A.raised B.risen C.reduced D.maintained constant
单项选择题 It should be ensured that only （） vapor is handled by the refrigeration compressor.
单项选择题 A refrigerant gives up heat when it goes through （）.
单项选择题 A refrigerant boils and vaporizes in the （） in a compression refrigeration system.
