Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）<br>A:corrosion fretting<br>B:insufficient lubrication<br>C:abnormal wear<br>D:fatigue failure

Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）
A:corrosion fretting
B:insufficient lubrication
C:abnormal wear
D:fatigue failure

出自：海船船员证

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