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防火控制 : 18 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 6 |
| Cryptography | 1 |
| Electronics | 1 |
| Nautical | 1 |
| Project management | 1 |
| Rail transport | 1 |
| Steel production | 1 |
| Technology | 5 |
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