单项选择题
The upper section of a piston is called the （）
A.land
B.skirt
C.crown
D.plate
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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 -
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
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