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單項選擇題

A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）

A.a high viscosity index
B.a low viscosity index
C.neutralize acids
D.resist oxidation at high temperatures

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單項選擇題

The Total Base Number (TBN) value of diesel engine lube oil refers to its ability to （）

A.resist changes in viscosity with changes in temperature
B.resist emulsification
C.neutralize acids
D.resist oxidation at high temperatures

單項選擇題

One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）

A.high TBN value
B.low oil floc point
C.low oil demulsibility
D.low oil neutralization number