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指示符号 : 23 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Computers | 1 |
| Economy | 1 |
| Electronics | 4 |
| General | 1 |
| Information technology | 3 |
| Librarianship | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 5 |
| Wind Energy | 1 |
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