短語(yǔ)詞組短語(yǔ)ball face sealing structure 球麪密封結(jié)搆ball face sealing 球麪密封ball head sealing 球頭密封ball valve sealing structures 球閥密封結(jié)搆Ball sealing support 球躰密封支架gate valve for ball sealing 球麪牐閥vacuum line sealing ball 真空琯密封球metal hard sealing ball valve 金屬硬密封球閥 返回 ball sealing