A.move in an opening direction
B.move in a closing direction
C.either open or close
D.not move at all
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A.help preheat the air for the furnaces
B.help preheat the feedwater
C.protect economizer from excessive heat
D.prevent excessive furnace heat losses
A.the bilges
B.the periscope
C.the water level
D.the oil pressure
A.excess stresses will not be set up in the boiler
B.the decks will not be covered with soot
C.the soot will be swept toward the uptakes
D.there will not be a loss of steam pressure
A.bottom-blow valve
B.skin valve
C.feed-check valve
D.feed-stop valve
A.a system with a Hydraulic Power Supply (HPS) unit
B.a system with roller guides for exhaust valves
C.a system with an electronically controlled Alpha Lubricator
D.a system directly powered by electric motor
最新試題
To proceed to the assistance of a ship in distress is（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
Which of the following items don’t belong to dock repair works?（）
The condensers located in various stages of a flash evaporator are cooled by（）
If separating effect is not good, which measure should be taken （）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The treatment of the fuel oils involves storage, heating, filtering and（）
Diesel engine air start system check valves are opened by （）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.