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特种 管 : 13 phrases in 8 subjects |
| Aviation | 1 |
| Economy | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Management | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
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