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| 频率保护: 16 phrases in 8 subjects |
| Air defense | 2 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 4 |
| Information technology | 2 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 2 |
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