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| предохранительный колпак; крышка; футерка | |||
| предохранитель резьбы (护管丝口) | |||
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护丝 : 23 phrases in 6 subjects |
| Drilling | 2 |
| Electronics | 6 |
| General | 7 |
| Oil and gas technology | 1 |
| Oil processing plants | 1 |
| Technology | 6 |
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