单选题Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.Amain bearingsBconnecting rod bearingsCpiston pin bushingsDAll of the above
单选题
Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.
A
main bearings
B
connecting rod bearings
C
piston pin bushings
D
All of the above
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