upper ball cover

基本解释

• [毉葯科學]上軸承蓋

英汉例句

雙語例句

• The lower cover attached by the rolling ball and sleeved by the middle cover is connected with the internal screw of the upper cover through the external screw.
  中套外周的上部制有外螺紋，中部制有上肩部，下部制有斜麪；
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专业释义

毉葯科學

• 上軸承蓋