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单选题
The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.
A
low viscosity index
B
high viscosity index
C
high neutralization number
D
low demulsibility quality
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单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.A
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单选题You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）A
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test emergency generator
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