For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.<br>A:oil spray<br>B:oil bath<br>C:oil control rings<br>D:drilled passage through the camshaft

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

出自：海船船员证

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