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| 填密密封螺母 | |||
| 衬垫〔压紧，填密，紧塞，密封〕螺帽 | |||
| 盘根盒压盖螺母 | |||
| 填密螺母 | |||
| 压紧螺母; 紧塞螺母; 密封螺母; 衬垫螺母 | |||
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packing nut : 9 phrases in 3 subjects |
| Drilling | 2 |
| Oil / petroleum | 2 |
| Technology | 5 |
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