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材料块 : 20 phrases in 9 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Chemistry | 2 |
| General | 2 |
| Metallurgy | 5 |
| Plastics | 1 |
| Polymers | 1 |
| Refrigeration | 1 |
| Technology | 6 |
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