单选题For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an ().Aoil sprayBoil bathCoil control ringsDdrilled passage through the camshaft

单选题
For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an ().
A

oil spray

B

oil bath

C

oil control rings

D

drilled passage through the camshaft


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