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單項選擇題

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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單項選擇題

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

單項選擇題

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