Lubricating oil used in a diesel engine serves to（）<br>A:reduce the wear of bearing surfaces<br>B:cool the bearing surfaces<br>C:assist in sealing bearing surfaces<br>D:all of the above

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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