The numerical result calculated by the formula for estimating the cetane number of distillate fuels from American Petroleum Institute (API) gravity and midboiling point.
用美国石油学会比重度和中沸点估算馏分燃料十六烷值公式计算得到的数值结果。
Crude oil is commonly classified as light, medium or heavy, referring to its gravity as measured on the American Petroleum Institute (API) Scale.
原油通常分为轻型，中型或重型，所指的是对美国石油学会(API)严重程度的规模衡量。
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