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| 31. | bottom fastening bolt |
| 底螺栓 |
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| 32. | convergence bolt |
| 会聚螺栓 |
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| 33. | fish plate bolt |
| 鱼尾板螺栓 |
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| 34. | positioning bolt |
| 定位螺栓 |
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| 35. | a stud; a column bolt |
| 柱螺栓 |
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| 36. | bolt shank extruding |
| 螺栓挤压 |
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| 37. | strengthening screw bolt |
| 强力螺栓 |
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| 38. | cylinder stud bolt |
| 汽缸螺栓 |
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| 39. | hexagonal-head bolt |
| 六角螺栓 |
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| 40. | top fastening bolt |
| 顶螺栓 |
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