T227-1993
用比重计法测定原油和液态石油产品的密度 相对密度(比重) 或 API 比重的标准规范(第十九版;ASTM D1298-85(1990))
Standard Specification for Density@ Relative Density (Specific Gravity)@ or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method (Nineteenth Edition; ASTM D1298-85(1990))