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
The shipboard oil pollution emergency plan will be invalid after （）
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
Cold weather starting of a diesel engine may be made easier by（）
（） is not installed on the main switchboar.
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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.