One of function of diesel engine lubricating oil is to （）<br>A:induce carbon formation on cylinder walls<br>B:improve fuel penetration in the combustion space<br>C:form a friction reducing film between mating surfaces<br>D:lubricate the fuel injection

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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