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單項(xiàng)選擇題

Diesel engine piston seizure can be caused by （）

A.poor cooling of cylinder walls
B.improper cooling of the piston
C.insufficient piston lubrication
D.all of the above

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單項(xiàng)選擇題

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）

A.natural aspiration
B.masked intake valves
C.air cells
D.scavenging air

單項(xiàng)選擇題

Improperly fitted piston rings in a diesel engine can cause（）

A.excessive lube oil consumption
B.lower than normal lube oil temperature
C.higher than normal exhaust back pressure
D.excessive crankshaft end play

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