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
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相关考题
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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 -
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 -
单项选择题
Cast iron pistons used in large propulsion diesel engines are constructed with （）
A.not taper what so ever
B.the skirt being tapered and smaller than the crown
C.the skirt being tapered and larger than the crown
D.the crown being tapered and smaller than the skirt
