oxygenasen.氧酶oxygenn.氧；氧气oxygen mask altitude使用氧气面罩的高度, 吸氧高度oxygen/coal ratio氧煤比oxygen supply system供氧系统oxygen hydrogen cell氧 氢电池oxygenation property氧合性能oxygen trigger valve供氧开关(活门)oxygen-diluted air贫氧空气oxygen-natural gas氧-天然气oxygen uptake device氧吸收装置oxygen furnace steel吹氧炼钢