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單項選擇題

The upper section of a piston is called the （）

A.land
B.skirt
C.crown
D.plate

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單項選擇題

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

單項選擇題

Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?（）

A.Sludge
B.Gasoline
C.Fuel oil
D.Lube oil

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