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| 频率计数器 | |||
| 频率计数器 | |||
| 计数式频率计 | |||
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frequency counter : 16 phrases in 6 subjects |
| Air defense | 3 |
| Electronics | 4 |
| Geophysics | 1 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 5 |
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