... 比重计；流速表 hydrometer 比重计标度 american petroleum institute scale; api scale; hydrometer degree 比重计称重 weighting of hydrometer ...
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API gravity scale API 重度表
API Gravity Scale 美国石油协会
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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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