Which of the listed characteristics of lube oil are the most important to the engineer fro

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Which of the listed characteristics of lube oil are the most important to the engineer from an operational standpoint?

A.Ash content, carbon residue, and gravity

B.Viscosity, acidity, and demulsibility

C.Pour point, flash, point, and precipitation number

D.Auto-ignition point, viscosity index, and film strength

请帮忙给出正确答案和分析,谢谢!

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