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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

單項選擇題

The water in an auxiliary boiler should be tested daily for （）.

A.dissolved oxygen
B.chlorides
C.sludge
D.dissolved nitrogen