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| conceptual level; conceptual phase | |||
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方案 阶段 : 22 phrases in 9 subjects |
| Aviation | 2 |
| Bridge construction | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Mining | 1 |
| Natural sciences | 1 |
| Space | 6 |
| Technology | 7 |
| United Nations | 2 |
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