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單項(xiàng)選擇題

At bottom dead center, the centerline of the connecting rod usually coincides with the（）

A.angularity of the piston motion
B.inertia moment from the piston
C.centerline of the cylinder
D.centerline of the king pin

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單項(xiàng)選擇題

Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）

A.Worn intake valve guides
B.Pitted pre-combustion chambers
C.Loose valve tappets
D.High exhaust back pressure

單項(xiàng)選擇題

Late fuel oil injection in a diesel engine can result in （）

A.fuel knock
B.increased power
C.low compression pressure
D.high exhaust temperature

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