A.residual carbon deposits
B.lube oil viscosity breakdown
C.uneven heat expansion of the rings
D.uneven heat expansion of the piston
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A.one-half engine speed
B.the same as engine speed
C.twice engine speed
D.four times engine speed
A.air intake
B.a fuel outlet
C.cooling water inlets
D.exhausting combustion gas
A.poor cooling of cylinder walls
B.improper cooling of the piston
C.insufficient piston lubrication
D.all of the above
A.natural aspiration
B.masked intake valves
C.air cells
D.scavenging air
A.excessive lube oil consumption
B.lower than normal lube oil temperature
C.higher than normal exhaust back pressure
D.excessive crankshaft end play
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Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
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To proceed to the assistance of a ship in distress is（）
The shipboard oil pollution emergency plan will be invalid after （）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.