单项选择题
A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）
A.Gasoline B.Water C.Lubricating oil D.sulphur compounds
单项选择题 Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）
单项选择题 Heavy residual fuel oils are heated prior to centrifuging to （）
单项选择题 In a diesel engine, blow-by is generally the result of worn（）
