单项选择题
Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）
A.The oil oxidizes and forms carbon deposits B.The viscosity increases C.Engine oil consumption decreases D.Lubricating qualities of the oil are enhanced
单项选择题 The oxidation by-products forming in diesel engine lube oil can cause （）
单项选择题 Surface irregularities, such as erosion and pitting on injection pump plungers, will（）
单项选择题 Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）
