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| 频率展开 | |||
| 频率展宽［扩展］ | |||
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frequency spread : 19 phrases in 9 subjects |
| Air defense | 1 |
| Artificial intelligence | 1 |
| Aviation | 1 |
| Computer networks | 1 |
| Electronics | 6 |
| Information technology | 3 |
| Space | 3 |
| Technology | 1 |
| Telecommunications | 2 |
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