The main function of piston compression rings is to _______.A.prevent excessive cylinder l

The main function of piston compression rings is to _______.

A.prevent excessive cylinder liner wear

B.reduce friction losses in the engine

C.seal the space between the piston and the liner

D.limit upward flow of lube oil into the combustion space

请帮忙给出正确答案和分析，谢谢！

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