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垛堆层 错 : 41 phrases in 9 subjects |
| Agriculture | 1 |
| Air defense | 4 |
| Chemistry | 1 |
| Electronics | 10 |
| General | 3 |
| Metallurgy | 14 |
| Space | 3 |
| Steel production | 1 |
| Technology | 4 |
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