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文件 保密 : 17 phrases in 10 subjects |
| Aviation | 2 |
| Business | 2 |
| Commerce | 1 |
| Economy | 4 |
| Electronics | 2 |
| General | 1 |
| Project management | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 2 |
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