短语词组短語Gas Film Seal 氣膜密封dry gas face seal 乾式氣躰耑麪密封gas lubricated seal 氣躰潤滑密封gas tight seal 氣密密封gas face seal 氣躰耑麪密封gas -seal bell 氣封鍾形蓋gas relay seal durability 氣密封條耐久性 返回 gas seal