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單項選擇題

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

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單項選擇題

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

單項選擇題

The humidity of the atmosphere can be determined by the use of the（）

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

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