单项选择题
If the capacity of the refrigeration compressor is too small, the excess vapor will accumulate in the evaporator, causing the pressure to （）.
A.rise B.fall C.be maintained constant D.None of the above is true
单项选择题 In the refrigeration compressor the temperature of the vapor is （） by compression.
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 （）.
