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| 石油 化学: 85 phrases in 9 subjects |
| Education | 2 |
| Environment | 2 |
| General | 57 |
| Geochemistry | 1 |
| Geology | 1 |
| Name of organization | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 9 |
| Technology | 11 |
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