单选题Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）AWorn intake valve guidesBPitted pre-combustion chambersCLoose valve tappetsDHigh exhaust back pressure
单选题
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
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