单项选择题
A.lowest absolute humidity B.lowest relative humidity C.highest absolute humidity D.highest relative humidity
The latent heat of water vapor in air is dependent upon...
单项选择题The latent heat of water vapor in air is dependent upon the （）
A.dry bulb temperature B.wet bulb temperature C.dew point D.dry point
If you find an extremely large refrigerant leak while u...
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
Before charging a refrigeration unit, the refrigerant c...
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
