Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）<br>A:increase the liner area covered by the oil film<br>B:maintain an oil film on the lower liner where scuffing is prevalent<br>C:keep excess oil away from intake and exhaust ports<br>D:help cushion piston skirt side thrust by providing a hydrodynamic oil wedge

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

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