A.Non-harmonic speed
B.Critical speed
C.Maximum speed
D.Design maximum speed
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A dirty fuel oil filter is can be detected by （）
Ⅰ.fuel oil analysis
Ⅱ.observing the pressure drop across the filter
A.Ⅰonly
B.Ⅱonly
C.eitherⅠorⅡ
D.neitherⅠnor
A.increase the density of the intake air
B.decrease turbocharger power usage
C.reduce exhaust gas temperature
D.compensate for turbocharger PRM fluctuations
A.high oil pressure
B.excessive bearing end play
C.plugged oil control rings
D.engine overload
A.leaking delivery valve
B.excessive bearing end play
C.plugged injector spray hole
D.increased plunger stroke
A.graphite packing
B.sealing compound
C.lubricating oil
D.gaskets
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Diesel engine air start system check valves are opened by （）
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Under MARPOL Code the ship to which it applies has to carry （）
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