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频率 范 围 : 37 phrases in 13 subjects |
| Air defense | 4 |
| Aviation | 4 |
| Communications | 2 |
| Electronics | 3 |
| General | 1 |
| Information technology | 1 |
| Otorhinolaryngology | 1 |
| Piezoelectric crystals | 3 |
| Project management | 1 |
| Shipbuilding | 1 |
| Space | 5 |
| Technology | 6 |
| Telecommunications | 5 |
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