Which one of the following is not generally recognized as one constitute of bilge water?（）

单项选择题A centrifugal compressor’s purge recovery unit（）

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（）

A.re-evaporator
B.receiver
C.dehydrator
D.solenoid

单项选择题The humidity of the atmosphere can be determined by the use of the（）

A.anemometer
B.potentiometer
C.manometer
D.psychrometer

单项选择题In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）

A.opening more bypass lines
B.opening additional expansion valves
C.adding refrigerant
D.speeding up the machine

单项选择题The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）

A.manifold
B.condenser
C.chamber
D.plenum