美利体育登录入口官网:CSN EN ISO 6974-5:2014 天然气 用气相色谱法测定组成及相关的不确定度 第5部分:氮气、二氧化碳、C1至C5烃类和C6+烃类的等温法
Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons