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信号 键 : 31 phrases in 10 subjects |
| Air defense | 4 |
| Business | 1 |
| Construction | 1 |
| Electronics | 7 |
| Finances | 1 |
| General | 1 |
| Geophysics | 1 |
| Oil / petroleum | 2 |
| Technology | 9 |
| Telecommunications | 4 |
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