Electromagnetic compatibility - electrical apparatus for the detection and measurement of combustible gases , toxic gases or oxygen ; german version en 50270 : 1999 电磁兼容性.可燃气体有毒气体或氧气的检测和测量用
Respiratory equipment - open - circuit self - contained diving apparatus for use with compressed nitrox and oxygen - requirements , testing , marking 呼吸设备.使用压缩硝基气体和氧气的开路配套式潜水仪.要求试验标记
However , that may be where future moon explorers get their next breath of air : the moons dusty layer of soil is nearly half oxygen 然而，它们可能是日后月球探索者获得氧气的来源。原来月球土壤尘埃层的成份中有一半是氧气。
Respiratory equipment - open - circuit self - contained diving apparatus for use with compressed nitrox and oxygen - requirements , testing , marking ; german version en 13949 : 2003 呼吸设备.使用硝基气体和氧气的开路自主式潜水仪.要
The discovery of traces of early oxygen was made in a study of a 3 , 000 - foot - long rock core extracted in western australia 氧气的出现可能更早这个结论，是在对澳大利亚西部一块3000英尺长的岩石的芯部萃取物质的研究过程中作出的。
Previously , the earliest indications of oxygen had been from between 2 . 3 billion and 2 . 4 billion years ago when the " great oxidation event " occurred 以前，最早氧气的迹象出现在2 . 3亿和2 . 4亿多年前，那时发生了"巨大的氧化事件" 。
Hence it is becoming one of the basic pemfc design jobs to improve the even distribution and the concentration of oxygen on cathode side 于是通过气场设计提高电池阴极侧催化层氧气的浓度和分布均匀性，成为pemfc基本的设计工作之一。
And when diving , marine mammals ' blood travels only to the parts of the body that need oxygen , such as the heart , the brain and the swimming muscles 当潜入水中时，海洋哺乳动物的血液仅流经身体需要氧气的部位，如心、脑和游泳用的肌肉。
Fish : amy , fish don ' t breathe air as you humans do . we use our gills to get oxygen from the water , so fish can ' t breathe out of water 鱼类并不像你们人类那样需要呼吸空气。我们是通过我们的鳃从水中吸取氧气的，所以鱼离开水是无法呼吸的。
Optic and optical instruments - contact lenses - part 1 : determination of oxygen permeability and transmissibility by the fatt method iso 9913 - 1 : 1996 ; german version en iso 9913 - 1 : 1998 光学和光学仪器.隐形眼镜.第1部分:用fatt法对氧气的
