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| 重石油; 重质原油; 重质油; 重原油 | |||
| 重油; 重质石油 | |||
| тяжёлая нефть: 6 phrases in 4 subjects |
| General | 3 |
| Geology | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
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