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煤 油气 : 60 phrases in 12 subjects |
| Agriculture | 1 |
| Architecture | 1 |
| Automobiles | 1 |
| Aviation | 2 |
| Chemistry | 2 |
| Company name | 1 |
| Earth sciences | 1 |
| General | 6 |
| Metallurgy | 2 |
| Oil / petroleum | 4 |
| Oil processing plants | 1 |
| Technology | 38 |
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