短語詞組短語gas -tightness 不透氣性Gas Storage Tightness 氣庫密封性concrete gas -tightness 混凝土氣密性Test method for gas -tightness 氣密性測試方法gas tightness test 氣密性試騐leak gas tightness 密閉度capsule gas tightness 氣密性Gas Tightness Good 氣密性好 返回 gas tightness