DIN EN ISO 15403-1:2009
天然气.用作车用压缩燃料的天然气.第1部分:质量名称(ISO 15403-1:2006),DIN EN ISO 15403-1:2009-10英文版本
Natural gas - Natural gas for use as a compressed fuel for vehicles - Part 1: Designation of the quality (ISO 15403-1:2006); English version of DIN EN ISO 15403-1:2009-10