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| 多环化合物 | |||
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| 多环化合物 | |||
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polycyclical compound : 8 phrases in 7 subjects |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Food service and catering | 1 |
| Oil processing plants | 1 |
| Technology | 2 |
| Water resources | 1 |
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