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| 频率衰减 | |||
| 频率特性曲线衰减 | |||
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frequency attenuation : 14 phrases in 7 subjects |
| Air defense | 1 |
| Bridge construction | 2 |
| Electronics | 1 |
| Geophysics | 1 |
| Oil / petroleum | 2 |
| Technology | 4 |
| Telecommunications | 3 |
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