单项选择题
In the common rail system, excessive pressure in the header may be caused by （）
A.improper adjustment of the bypass valve B.a dribble in the fuel injection nozzle C.insufficient leak-off through injection nozzle packing D.a malfunctioning injection nozzle
单项选择题 Diesel engine valve springs function to （）
单项选择题 Worn diesel engine intake valve guides can result in （）
单项选择题 If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）
