单选题The primary purpose of oil control rings on a diesel piston is to（）Aprovide a reservoir for cylinder lubricationBpump oil into the combustion space for cylinder coolingCprevent excessive lubricating oil consumptionDallow hydraulic oil film formation on the cylinder
单选题
The primary purpose of oil control rings on a diesel piston is to（）
A
provide a reservoir for cylinder lubrication
B
pump oil into the combustion space for cylinder cooling
C
prevent excessive lubricating oil consumption
D
allow hydraulic oil film formation on the cylinder
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