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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单项选择题

A.dry bulb temperature
B.wet bulb temperature
C.dew point
D.dry point

单项选择题

A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue

单项选择题

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