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电磁辐射波 : 14 phrases in 9 subjects |
| Air defense | 1 |
| Earth sciences | 3 |
| Electric machinery | 1 |
| Electronics | 1 |
| General | 1 |
| Geophysics | 2 |
| Information technology | 1 |
| Space | 1 |
| Technology | 3 |
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