A dark exhaust from a running diesel engine can be caused by （）<br>A:late ignition<br>B:water in the fuel<br>C:high compression temperature<br>D:starting valve stuck open

A dark exhaust from a running diesel engine can be caused by （）
A:late ignition
B:water in the fuel
C:high compression temperature
D:starting valve stuck open

出自：海船船员证

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