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單項選擇題

Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? （）

A.Viscosity is decreased
B.Octane number is altered
C.Pump speed is decreased
D.Blower’s speed is decreased

單項選擇題

It is easier to replace a dry cylinder liner than a wet one because（）

A.of the thin wall thickness
B.honing makes it easier to maintain the desired oil ilm
C.water seals are not required
D.it fits more loosely due to a decrease in heat transfer through the composite wall