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。

youdao

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。

youdao