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單項選擇題

Metal particles accumulated from the wearing of components in a diesel engine can result from lube oil that has been contaminated with（）.

A.abrasive particles
B.metallic oxides
C.corrosive acids
D.any or all of the above

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單項選擇題

In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）

A.low firing pressure
B.low exhaust temperature
C.mechanical knock in each cylinder
D.fuel knock in each cylinder

單項選擇題

The cylinder liner forming the cylinder wall and the inside of the water jacket is called a（）

A.dry liner
B.wet liner
C.jacket liner
D.corrugated liner

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