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纯度 级 : 13 phrases in 10 subjects |
| Agriculture | 1 |
| Animal husbandry | 2 |
| Commerce | 1 |
| Electronics | 2 |
| General | 1 |
| Metallurgy | 1 |
| Plastics | 2 |
| Polymers | 1 |
| Space | 1 |
| Technology | 1 |
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