A.admit only enough fresh outside air to provide proper ventilation
B.reduce the air reheating system load
C.lower the compressor head pressure
D.operate the purge recovery unit continuously
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A.lowest absolute humidity
B.lowest relative humidity
C.highest absolute humidity
D.highest relative humidity
A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue
A.flushed with clean refrigerant oil
B.purged with the refrigerant
C.washed with an ammonia and alcohol solution
D.grounded to compressor
A.petroleum crystals
B.phosgene gas
C.water vapor
D.carbon monoxide
A.be clear
B.be blue
C.be light green
D.show bubbles
最新試題
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（） is not installed on the main switchboar.
To proceed to the assistance of a ship in distress is（）
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A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
Flame failure in an automatically fired auxiliary boiler can from a/an （）
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As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.