A.check valve
B.non-return valve
C.steam trap
D.quick closing trap
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A.stop valves
B.non-return valves
C.quick closing valves
D.relief valves
A.a pressure reducing valve
B.a pilot valve
C.an operating piston
D.downstream pressure
A.adjusting a nut
B.a pre-tensioned spring
C.any spring
D.upstream pressure
A.aeration tanks
B.settling tanks
C.disinfection agent
D.anaerobic bacteria
A.accidents
B.special valve chests
C.interchangeable blanks
D.connecting passages
最新試題
The treatment of the fuel oils involves storage, heating, filtering and（）
To proceed to the assistance of a ship in distress is（）
The condensers located in various stages of a flash evaporator are cooled by（）
Which of the following items don’t belong to dock repair works?（）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
The cetane rating of diesel fuel is an indication of the （）
The main purpose of port State control is not to（）
The shipboard oil pollution emergency plan will be invalid after （）
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