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分线控制 : 13 phrases in 10 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Computer networks | 1 |
| Earth sciences | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 1 |
| Rail transport | 2 |
| Space | 1 |
| Technology | 1 |
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