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阶形的 : 18 phrases in 10 subjects |
| Architecture | 1 |
| Bridge construction | 2 |
| Electronics | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 3 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
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