单项选择题
A.an obstruction in an cylinder B.water accumulation in some engine cylinders C.low starting air pressure D.low scavenge air pressure
Black smoke exhausting from a diesel engine indicates（）...
单项选择题Black smoke exhausting from a diesel engine indicates（）
A.proper fuel injection B.water in the fuel C.incomplete combustion D.burning of lube oil
Engine operating conditions may be indicated by the col...
单项选择题Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）
A.an insufficient speed droop setting B.an overloaded engine C.clogged drain holes in the oil control rings D.complete combustion
A dark exhaust from a running diesel engine can be caus...
单项选择题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
