短語(yǔ)詞組短語(yǔ)gas -tightness 不透氣性Gas Storage Tightness 氣庫(kù)密封性concrete gas -tightness 混凝土氣密性Test method for gas -tightness 氣密性測(cè)試方法gas tightness test 氣密性試驗(yàn)leak gas tightness 密閉度capsule gas tightness 氣密性Gas Tightness Good 氣密性好 返回 gas tightness