单选题The main purpose of the piston oil scraper rings is to （）.Aseal the space between the piston and the linerBreduce the amount of lube oil burned in the combustion chamberCtransmit heat from the piston to the cylinder linerDdamp out fluctuations of the piston side thrust
单选题
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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相关考题：
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