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| refining The processing of raw material to remove impurities; extraction (Öl) | |||
| purification | |||
| refining | |||
| refinement | |||
| Raffination: 19 a las frases, 10 temas |
| Agricultura | 1 |
| Ambiente | 1 |
| Carbón | 2 |
| Ciencia de los materiales | 1 |
| Estadísticas | 1 |
| General | 1 |
| Industria | 1 |
| Industria de grasas y aceites | 1 |
| Metalurgia | 5 |
| Química | 5 |