单项选择题
When air is at its dew point it is at its（）
A.lowest absolute humidity
B.lowest relative humidity
C.highest absolute humidity
D.highest relative humidity
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相关考题
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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 -
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
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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
