A.filers
B.separators
C.ducted traps
D.dehumidifiers
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A.low relative humidity is maintained
B.triple banded squirrel cage fans are used
C.air circulation is a maximum
D.high relative humidity is maintained
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
A.suction service valve as a vapor
B.suction service valve as a liquid
C.discharge service valve as a vapor
D.charging valve as a liquid
A.Air or Nitrogen
B.Seawater or Fresh water
C.Sodium Nitrate brine
D.Calcium Sulfate brine
The effective temperature of air is dependent upon（）
Ⅰ.relative humidity
Ⅱ.air velocity
A.Ⅰonly
B.Ⅱonly
C.Both Ⅰand Ⅱ
D.NeitherⅠnor Ⅱ
最新試題
The cetane rating of diesel fuel is an indication of the （）
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
Flame failure in an automatically fired auxiliary boiler can from a/an （）
Which of the following items don’t belong to dock repair works?（）
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
Using a file without a handle may result in （）