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| 催化选择性: 22 phrases in 9 subjects |
| Automobiles | 5 |
| Chemistry | 4 |
| Nautical | 3 |
| Oil / petroleum | 3 |
| Oil processing plants | 2 |
| Plastics | 1 |
| Technology | 2 |
| Textile industry | 1 |
| Water resources | 1 |
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