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單項(xiàng)選擇題

The adverse effects of burning high sulfur fuel can be compensated for by using a cylinder oil having sufficient（）

A.dispersant additives
B.floc point
C.alkalinity additives
D.ignition quality

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單項(xiàng)選擇題

Scuffed cylinder liner surfaces in a diesel engine can result form（）

A.starting the engine hot
B.knurling the piston skirt
C.operating an overheated engine
D.using scuff resistant piston rings

單項(xiàng)選擇題

When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）

A.the amount of lube oil additives increase
B.piston speeds increase
C.injection pressure decrease
D.engine speeds decrease