oxygen unit meaning in Chinese

氧气元
氧气装置

Aircraft ground support equipment - specific requirements - nitrogen or oxygen units
飞行器地面支持设备.特殊要求.氮气或氧气装置
Aircraft ground support equipment - specific requirements - part 18 : nitrogen or oxygen units
飞行器地面支持设备.特殊要求.第18部分:氮或氧气装置
Aircraft ground support equipment - specific requirements - part 18 : nitrogen or oxygen units ; german version en 12312 - 18 : 2005
飞行器地面支持设备.特殊要求.第18部分:氮或氧装置