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氮 杂环 : 85 phrases in 9 subjects |
| Chemistry | 33 |
| General | 29 |
| Metallurgy | 1 |
| Oil / petroleum | 4 |
| Pharmacology | 2 |
| Polymers | 11 |
| Technology | 1 |
| Textile industry | 2 |
| Water resources | 2 |
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