单选题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（）.Aprevent any lubricant from reachingBprevent excessive lubrication from reaching the combustion spaceCProvide metal-to-metal contact to seal the cylinder against blow-byDassure a positive means of scraping carbon accumulation from the cylinder
单选题
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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