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成分 结 构 : 20 phrases in 9 subjects |
| Aviation | 1 |
| Computer networks | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 3 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 6 |
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