單項(xiàng)選擇題

The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）

A.salinity is abnormally high
B.steam demand is too high
C.water level is abnormally low
D.feedwater flow is low

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單項(xiàng)選擇題

Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.

A.internal crankshaft passages
B.immersion in oil
C.splash lubrication
D.injection lubrication

單項(xiàng)選擇題

What function is provided by the crankcase ventilation system on some diesel engines?（）

A.Increases the sludge forming tendency of lube oil
B.Prevents the accumulation of combustible gases
C.Improves lube oil cooling
D.Improves cold weather starting