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單項選擇題

A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.

A.contaminated with sludge
B.contaminated with carbon
C.diluted with fuel oil
D.diluted with water

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單項選擇題

The emulsion of the oil is mainly caused by （）.

A.the solid impurities of large particle
B.the solid impurities of fine particle
C.the water content
D.both water and solid impurities

單項選擇題

Impurities in the fuel oil will affect the operation of the engine, which has （） the use of separator and some other devices.

A.brought about
B.caused for
C.resulted from
D.led

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