Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）<br>A:water in the fuel<br>B:insufficient fuel for combustion<br>C:clogged air intake passages<br>D:burning lubricating oil

Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）
A:water in the fuel
B:insufficient fuel for combustion
C:clogged air intake passages
D:burning lubricating oil

出自：海船船员证

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