helium gas
短语词组
- helium cover gas system 氦气覆盖系统
- helium group gas [化学]氦族气体
- helium natural gas 氦气藏
- helium m gas 氦气
- helium coolant gas temperature 氦气冷却剂温度
- rich helium natural gas 富氦天然气
- non -helium shielding gas mixture 无氦混合气体
- helium gas compressor 氦压缩机
- helium gas circulator 氦气风机 返回 helium gas