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 ISPS Code consists of a mandatory section-Part A, which shows（）
If separating effect is not good, which measure should be taken （）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Cold weather starting of a diesel engine may be made easier by（）
Using a file without a handle may result in （）
Which of the following items don’t belong to dock repair works?（）
The main purpose of port State control is not to（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
（） is not installed on the main switchboar.