单项选择题
In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the liner
A.Ⅰ only B.Ⅱ only C.both Ⅰ and Ⅱ D.neither Ⅰ and Ⅱ
单项选择题 Excessive lube oil consumption can result from worn or broken（）
单项选择题 In an operating diesel engine, pre-ignition can be caused by （）
单项选择题 One cause of diesel engine surging can be a result of （）
