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switching channel : 40 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Communications | 1 |
| Electric machinery | 1 |
| Electronics | 16 |
| Information technology | 3 |
| Project management | 1 |
| Rail transport | 1 |
| Shipbuilding | 2 |
| Space | 2 |
| Technology | 6 |
| Telecommunications | 4 |
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