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單項選擇題

Which of the following will be the function of lubricating oil used in marine engines?（）

A.to remove heat from oil cooled pistons
B.to wash away wear detritus
C.to neutralize acidic products
D.all of the above

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單項選擇題

Which of the following may take place if the clearance of the main bearings are excessive?（）

A.bearing knocks
B.dropping of pressure of LO
C.noises
D.all the above

單項選擇題

Which of the following may lead to the engine NOT to start on air?（）

A.starting air pressure too high
B.correct timing of starting air valves
C.three of the six starting valves stuck
D.the turning gear disengaged

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