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| 磁性氧化铁; 四氧化三铁 | |||
| 磁性氧化物 | |||
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magnetic oxide : 20 phrases in 6 subjects |
| Chemistry | 3 |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 6 |
| Space | 1 |
| Technology | 8 |
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