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值信 号 : 46 phrases in 13 subjects |
| Air defense | 3 |
| Automatic control | 2 |
| Aviation | 3 |
| Communications | 2 |
| Construction | 1 |
| Electronics | 9 |
| General | 2 |
| Geophysics | 3 |
| Information technology | 2 |
| Radio | 2 |
| Space | 3 |
| Technology | 13 |
| Telecommunications | 1 |
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