upper ball cover
基本解釋
- [醫(yī)藥科學(xué)]上軸承蓋
英漢例句
- 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，下部制有斜面；
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雙語例句
專業(yè)釋義
- 上軸承蓋