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| 钻杆护箍; 保护圈 | |||
| 护圈; 保险环; 安全环; 防护圈; 保护环; 保险圈; 轮箍扣环 | |||
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предохранительное кольцо : 7 phrases in 6 subjects |
| General | 1 |
| Jet engines | 2 |
| Military | 1 |
| Oil and gas technology | 1 |
| Oil processing plants | 1 |
| Technology | 1 |
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