单项选择题
If you find an extremely large refrigerant leak while using a halide torch, your flame will（）
A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue
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相关考题
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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 -
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
