单选题A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）Acombustion gas blow-byBexcessive lubricationCproperly functioning ringsDinsufficient cylinder cooling
单选题
A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）
A
combustion gas blow-by
B
excessive lubrication
C
properly functioning rings
D
insufficient cylinder cooling
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