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磁读 头 : 18 phrases in 9 subjects |
| Agriculture | 1 |
| Electronics | 4 |
| Information technology | 2 |
| Mathematics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Space | 2 |
| Technology | 2 |
| Telecommunications | 2 |
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