单项选择题
A.Flash point improvers B.Pour point improvers C.Inhibitors D.Foam suppressors
Which of the following characteristic of lube oil helps...
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
A diesel engine exposed to widely varying ambient tempe...
单项选择题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
The Total Base Number (TBN) value of diesel engine lube...
单项选择题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
