A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）<br>A:combustion gas blow-by<br>B:excessive lubrication<br>C:properly functioning rings<br>D:insufficient cylinder cooling

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

出自：海船船员证

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