单项选择题
A.the solenoid valve to seize
B.the compressor to hunt
C.flash gas to form in the liquid line
D.the expansion valve to freeze open
单项选择题 In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the（）
单项选择题 The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）
单项选择题 A fluid coil will （）large quantities of heat when it changes state from a liquid to a vapor.