单项选择题
A.reclaims water
B.purges air without losing refrigerant
C.purges air with some loss of refrigerant
D.purges lube oil from the refrigerant
单项选择题 The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a（）
单项选择题 The humidity of the atmosphere can be determined by the use of the（）
单项选择题 In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）