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| 密 封 盖: 30 phrases in 10 subjects |
| Drilling | 1 |
| Electronics | 3 |
| General | 10 |
| Military | 1 |
| Missiles | 1 |
| Oil / petroleum | 1 |
| Oil and gas technology | 1 |
| Oil processing plants | 2 |
| Shipbuilding | 1 |
| Technology | 9 |
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