Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8 using two packed columns (ISO 6974-3:2000)
天然气 - 通过气相色谱法测定具有确定不确定度的组成 - 第3部分:使用两个填充柱(ISO 6974-3:2000)测定氢气 氦气 氧气 氮气 二氧化碳和碳氢化合物