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| counter; frequency meter | |||
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计数频率计 : 25 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 6 |
| Engineering geology | 1 |
| General | 1 |
| Geophysics | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Space | 3 |
| Technology | 9 |
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