单项选择题
Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.
A.excessive crankcase pressure
B.excessive lube oil temperature
C.contamination of the lube oil by water
D.contamination of the cooling water by lube oil
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相关考题
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单项选择题
The water in an auxiliary boiler should be tested daily for （）.
A.dissolved oxygen
B.chlorides
C.sludge
D.dissolved nitrogen -
单项选择题
A feed pump for an auxiliary boiler might lose suction if the （）.
A.boiler water level is low
B.feedwater is too hot
C.boiler steam demand is low
D.feedwater is too cold -
单项选择题
Fuel is admitted to a diesel engine cylinder through the （）.
A.intake valves
B.carburetor
C.exhaust ports
D.injector nozzles
