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字符 显示 : 34 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 5 |
| General | 1 |
| Information technology | 6 |
| Mathematics | 1 |
| Metallurgy | 4 |
| Space | 4 |
| Technology | 10 |
| Telecommunications | 1 |
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