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阴离子型 : 32 phrases in 9 subjects |
| Chemistry | 1 |
| Drilling | 1 |
| Electronics | 4 |
| Oil / petroleum | 9 |
| Plastics | 4 |
| Polymers | 3 |
| Technology | 6 |
| Textile industry | 1 |
| Water resources | 3 |
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