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| 油芯; 油砂芯 | |||
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| 油泥芯 | |||
| 油砂芯 | |||
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oil- core : 24 phrases in 7 subjects |
| Architecture | 2 |
| Chemistry | 2 |
| Compressors | 2 |
| Drilling | 2 |
| Metallurgy | 5 |
| Oil / petroleum | 4 |
| Technology | 7 |
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