A.stop valves
B.non-return valves
C.quick closing valves
D.relief valves
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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
A.a test valve
B.an inspection valve
C.a stop valve
D.a non-return valve
最新試題
If two A.C.generators are to be operated in parallel, the load is distributed evenly by()
To proceed to the assistance of a ship in distress is()
During the diesel engine running, the water level of F.W expansion tank should normally kept in the () level of glass tube.
Which one is NOT the ‘clear grounds’ for a more detailed inspection?()
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
() is not installed on the main switchboar.
If separating effect is not good, which measure should be taken ()
The shipboard oil pollution emergency plan will be invalid after ()
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()
The treatment of the fuel oils involves storage, heating, filtering and()