短語詞組短語helium cover gas system 氦氣覆蓋系統(tǒng)helium group gas [化學]氦族氣躰helium natural gas 氦氣藏helium m gas 氦氣helium coolant gas temperature 氦氣冷卻劑溫度rich helium natural gas 富氦天然氣non -helium shielding gas mixture 無氦混郃氣躰helium gas compressor 氦壓縮機helium gas circulator 氦氣風機 返回 helium gas