单项选择题
A.intake stroke B.exhaust stroke C.power stroke D.compression stroke
Telescopic pipes to the piston of a large slow-speed ma...
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
The water in an auxiliary boiler should be tested daily...
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
A feed pump for an auxiliary boiler might lose suction ...
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
