单项选择题
In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring groove
A.Ⅰ only B.Ⅱ only C.both Ⅰ and Ⅱ D.neither Ⅰ nor Ⅱ
In a diesel engine, an integral liner is one in which t...
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
Excessive lube oil consumption can result from worn or ...
单项选择题Excessive lube oil consumption can result from worn or broken（）
A.piston rings B.valve guides C.valve seals D.all of the above
In an operating diesel engine, pre-ignition can be caus...
单项选择题In an operating diesel engine, pre-ignition can be caused by （）
A.excessively late fuel injection B.oil in the air charge C.water in the fuel D.injection continuing after the fuel charge is ignited
