短語詞組短語Gas Film Seal 氣膜密封dry gas face seal 干式氣體端面密封gas lubricated seal 氣體潤滑密封gas tight seal 氣密密封gas face seal 氣體端面密封gas -seal bell 氣封鐘形蓋gas relay seal durability 氣密封條耐久性 返回 gas seal