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射 电脉冲 : 21 phrases in 10 subjects |
| Air defense | 2 |
| Aviation | 2 |
| Earth sciences | 2 |
| Electronics | 2 |
| General | 2 |
| Geophysics | 1 |
| Information technology | 4 |
| Radio | 1 |
| Space | 1 |
| Technology | 4 |
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