upper ball cover
基本解释
- [医药科学]上轴承盖
英汉例句
- 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纹,中部制有上肩部,下部制有斜面;
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双语例句
专业释义
- 上轴承盖