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| 21. | The nuts on these connections usually have hand wheels mounted on them. These connections are sometimes referred to as "hand-tights"because they are designed to be connected and sealed without the use of tools. |
| 这些接头上的螺母上通常装有手轮。因为它们不使用工具进行连接和密封，有时候这些接头称为手紧接头。 |
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| 22. | give a nut a good screw |
| 扭紧螺母 |
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| 23. | hexagon nut |
| 六角螺母 |
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| 24. | inserted nut abrasive discs and inseted nut ring wheels |
| 带螺母砂盘和带螺母环形砂轮 |
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| 25. | countersunk nut |
| 埋头螺母 |
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| 26. | square-head nut |
| 方头螺母 |
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| 27. | connecting rod nut |
| 连杆螺母 |
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| 28. | drive pinion adjusting nut |
| 传动齿轮调整螺母;传动小齿轮调节螺母 |
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| 29. | differential nut |
| 差动螺母 |
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| 30. | analyzing adapter |
| 检验接头|分析接头 |
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