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离子交换层 : 24 phrases in 14 subjects |
| Agriculture | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 1 |
| General | 1 |
| Genetics | 1 |
| Geology | 1 |
| Life sciences | 1 |
| Metallurgy | 2 |
| Plastics | 2 |
| Steel production | 1 |
| Technology | 7 |
| Telecommunications | 1 |
| Water resources | 3 |
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