Which of the listed cylinder liner surface conditions indicates proper lubrication?（）<br>A:Dull black appearance<br>B:Bright appearance<br>C:Thin layer of lacquer<br>D:Thick oily film

Which of the listed cylinder liner surface conditions indicates proper lubrication?（）
A:Dull black appearance
B:Bright appearance
C:Thin layer of lacquer
D:Thick oily film

出自：海船船员证

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