单项选择题
A.land B.skirt C.crown D.plate
Pitted reduction gear teeth having a deep blue color wi...
单项选择题Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with （）
A.excessive speed B.improper warm-up C.extreme misalignment D.inadequate lubrication
Which of the listed substances can be satisfactorily re...
单项选择题Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?（）
A.Sludge B.Gasoline C.Fuel oil D.Lube oil
The amount of fuel delivered by a unit injector is cont...
单项选择题The amount of fuel delivered by a unit injector is controlled by the （）
A.camshaft B.main spring C.rack position D.nozzle orifice size
