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單項選擇題

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

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單項選擇題

What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）

A.White
B.Black
C.Blue
D.Clear

單項選擇題

Combustion knock will most likely occur as a result of using a fuel with（）

A.low ignition quality
B.a high volatility
C.low ignition delay
D.a high cetane number

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