单项选择题

Before charging a refrigeration unit, the refrigerant charging lines should be（）

A.flushed with clean refrigerant oil
B.purged with the refrigerant
C.washed with an ammonia and alcohol solution
D.grounded to compressor

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单项选择题

In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decomposes and from （）.

A.petroleum crystals
B.phosgene gas
C.water vapor
D.carbon monoxide

单项选择题

In an operating refrigeration system low on refrigerant, a liquid line sight glass will（）

A.be clear
B.be blue
C.be light green
D.show bubbles

单项选择题

The thermal expansion valve reacts directly to the （）

A.temperature in the space being cooled
B.liquid refrigerant pressure at the solenoid valve
C.pressure drop across the evaporator coils
D.refrigerant gas superheat at the coil outlet