A.lowest absolute humidity
B.lowest relative humidity
C.highest absolute humidity
D.highest relative humidity
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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
A.temperature in the space being cooled
B.liquid refrigerant pressure at the solenoid valve
C.pressure drop across the evaporator coils
D.refrigerant gas superheat at the coil outlet
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The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
Cold weather starting of a diesel engine may be made easier by（）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Under MARPOL Code the ship to which it applies has to carry （）
Using a file without a handle may result in （）
The shipboard oil pollution emergency plan will be invalid after （）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
（） is not installed on the main switchboar.
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）