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数据库 结 构 : 23 phrases in 9 subjects |
| Aviation | 1 |
| Electronics | 4 |
| Geophysics | 1 |
| Information technology | 9 |
| Mathematics | 1 |
| Project management | 2 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 3 |
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