1 问题的提出国际上石油和石油产品通行的计量单位是体积计量单位 ,充分体现了优质优价 ,劣质低价的公平交易原则。目前我国在成品油 稳定轻烃的外输贸易交接计量领域乃大量使用质量流量计 ,但不久也将推行体积量交接的方法。因为大多数的质量流量计具备测量密度的能力 ,可组 1 PROBLEM PROBLEM Internationally, the unit of measurement for the passage of oil and petroleum products is the volumetric unit of measurement, which fully reflects the principle of fair trade with high quality, low price and low price. At present, China is massively using mass flow meters in the field of measuring the volume of foreign trade of light petroleum products destined to stabilize light hydrocarbons. However, the method of volume transfer will soon be implemented. Because most mass flow meters have the ability to measure density, they can be grouped