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| 离子类型 | |||
| ion type: 30 phrases in 8 subjects |
| Agriculture | 2 |
| Chemistry | 4 |
| Electronics | 1 |
| Metallurgy | 1 |
| Plastics | 2 |
| Polymers | 2 |
| Technology | 17 |
| Textile industry | 1 |
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