单项选择题

Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）

A.Low viscosity index
B.Low carbon forming tendencies
C.High film strength
D.High non-corrosive qualities

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单项选择题

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

单项选择题

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

单项选择题

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