短语词组短語Welded metal -bellows mechanical seal [機]銲接金屬波紋琯機械密封welded metal bellows mechanical seal 銲接金屬波紋琯機械密封formed metal bellows mechanical seal 壓力成型金屬波紋琯機械密封;壓力成型金屬波紋琯機械密封件 返回 metal bellows mechanical seal