The main purpose of the piston oil scraper rings is to （）.<br>A:seal the space between the piston and the liner<br>B:reduce the amount of lube oil burned in the combustion chamber<br>C:transmit heat from the piston to the cylinder liner<br>D:damp out fluctuations of the piston side thrust

The main purpose of the piston oil scraper rings is to （）.
A:seal the space between the piston and the liner
B:reduce the amount of lube oil burned in the combustion chamber
C:transmit heat from the piston to the cylinder liner
D:damp out fluctuations of the piston side thrust

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