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| frequency measurement | |||
| 频率测量: 41 phrases in 11 subjects |
| Air defense | 3 |
| Artificial intelligence | 1 |
| Aviation | 4 |
| Earth sciences | 2 |
| Electronics | 8 |
| General | 3 |
| Geophysics | 5 |
| Hydroelectric power stations | 1 |
| Project management | 1 |
| Space | 3 |
| Technology | 10 |
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