单选题Which of the listed characteristics of lube oil are the most important to the engineer from an operational standpoint?（）AAsh content, carbon residue, and gravityBViscosity, acidity, and demulsibilityCPour point, flash, point, and precipitation numberDAuto-ignition point, viscosity index, and film strength
单选题
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
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