短語詞組短語packing box seal 填料函密封lumped packing -seal 集裝式填料密封Packing oil seal 迫緊油封STEM PACKING or SEAL 填料或密封packing g seal 密封墊packing shaft seal 填料軸封packing water seal 水封HYDRAULIC PACKING & SEAL 國別double -stage packing element seal 雙級膠芯密封 返回 packing seal