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后混凝 : 50 phrases in 9 subjects |
| Aviation | 1 |
| Bridge construction | 6 |
| Electronics | 1 |
| Engineering geology | 3 |
| General | 1 |
| Hydroelectric power stations | 3 |
| Metallurgy | 1 |
| Rail transport | 1 |
| Technology | 33 |
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