Black smoke exhausting from an operating diesel engine can be caused by （）<br>A:fuel dribbling from leaking fuel injectors<br>B:burning fuel with a high carbon content<br>C:burning fuel with a high vanadium content<br>D:burning fuel with a lower sulphur content

Black smoke exhausting from an operating diesel engine can be caused by （）
A:fuel dribbling from leaking fuel injectors
B:burning fuel with a high carbon content
C:burning fuel with a high vanadium content
D:burning fuel with a lower sulphur content

出自：海船船员证

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