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| |||
| hydrogen treating | |||
| hardening | |||
| hydrogenation | |||
| hydrogenating activity | |||
| hydrogénation: 42 phrases in 10 subjects |
| Chemistry | 28 |
| Coal | 3 |
| Fat-and-oil industry | 1 |
| General | 1 |
| Metallurgy | 1 |
| Natural resourses and wildlife conservation | 2 |
| Oil / petroleum | 1 |
| Pharmacy and pharmacology | 2 |
| Technology | 2 |
| Transport | 1 |