短語詞組短語gas generating composition 氣體發(fā)生劑gas phase composition 氣相成分natural gas isotopic composition 甲烷碳同位素組成noble gas isotope composition 稀有氣體同位素組成Noble gas isotopic composition 惰性氣體同位素組成characteristics of gas source composition 氣源構成特點residual gas composition 剩余氣體成分Resistance to gas composition 耐氣體組分Combustion gas composition 燃氣組份 返回 gas composition