單項選擇題

Which of the following would cause a diesel to have black smoke?（）

A.leaky injector
B.water in the gas
C.too heavy oil
D.water in the oil

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單項選擇題

Which of the following will 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 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