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三角测量高程 : 25 phrases in 8 subjects |
| Architecture | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 2 |
| Remote sensing | 1 |
| Space | 1 |
| Technology | 17 |
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