White smoke exhausting from a diesel engine can be caused by a ()
Black smoke exhausting from a diesel engine indicates()
Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by ()
White smoke exhausting from an operating diesel engine may indicate ()
White smoke exhausting from an operating diesel engine may indicate ().
Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by ()
Black smoke exhausting from a diesel engine indicates()
White smoke exhausting from a diesel engine can result from ()
White smoke exhausting from a diesel engine can be caused by ()
Black smoke exhausting from an operating diesel engine can be caused by ()