短語詞組短語helium cover gas system 氦氣覆蓋系統(tǒng)helium group gas [化學(xué)]氦族氣體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 無氦混合氣體helium gas compressor 氦壓縮機(jī)helium gas circulator 氦氣風(fēng)機(jī) 返回 helium gas