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| frequency-response characteristic | |||
| frequency response characteristics | |||
| frequency response characteristic | |||
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| frequency response characteristic | |||
| 频率响 应 特性: 13 phrases in 8 subjects |
| Air defense | 1 |
| Automatic control | 3 |
| Aviation | 1 |
| Electronics | 2 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 2 |
| Telecommunications | 1 |
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