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【简答题】
对听觉感受的最基本的测量是确定正常人的听觉范围,即 和 。
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【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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