常见例句雙語例句The main parts of pump are pump casing, pump cover, impeller, shaft, sealing ring, shaft sleeve, bearing and shaft seal etc.泵主要由泵躰、泵蓋、葉輪、軸、密封環、軸套、軸承、軸封等零件組成。cstegzb.web.3150vip.cn 返回 bearing sleeve cover