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
单项选择题 The Total Base Number (TBN) value of diesel engine lube oil refers to its ability to （）
单项选择题 One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）
单项选择题 If a used lube oil analysis indicates an excessive chromate content, this means （）
