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To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.
A:prevent any lubricant from reaching
B:prevent excessive lubrication from reaching the combustion space
C:Provide metal-to-metal contact to seal the cylinder against blow-by
D:assure a positive means of scraping carbon accumulation from the cylinder

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出自：海船船员证

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