问题

Oil control rings used in two－stroke／cycle diesel engines are located near the bottom of t

Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to ________.

A.increase the liner area covered by the oil film

B.maintain an oil film on the lower liner where scuffing is prevalent

C.keep excess oil away from intake and exhaust ports

D.help cushion piston skirt side thrust by providing a hydrodynamic oil wedge

请帮忙给出正确答案和分析，谢谢！

参考答案

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