单选题One of function of diesel engine lubricating oil is to （）Ainduce carbon formation on cylinder wallsBimprove fuel penetration in the combustion spaceCform a friction reducing film between mating surfacesDlubricate the fuel injection
单选题
One of function of diesel engine lubricating oil is to （）
A
induce carbon formation on cylinder walls
B
improve fuel penetration in the combustion space
C
form a friction reducing film between mating surfaces
D
lubricate the fuel injection
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