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| 催化剂 氧化: 65 phrases in 11 subjects |
| Animal husbandry | 1 |
| Automobiles | 12 |
| Chemistry | 5 |
| General | 2 |
| Metallurgy | 4 |
| Oil / petroleum | 8 |
| Plastics | 1 |
| Polymers | 4 |
| Space | 1 |
| Technology | 19 |
| Water resources | 8 |
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