单选题Lubricating oil used in a diesel engine serves to()Areduce the wear of bearing surfacesBcool the bearing surfacesCassist in sealing bearing surfacesDall of the above

单选题
Lubricating oil used in a diesel engine serves to()
A

reduce the wear of bearing surfaces

B

cool the bearing surfaces

C

assist in sealing bearing surfaces

D

all of the above


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