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| 自动频率和相位控制 | |||
| 自动频率与相位控制 | |||
| 频率和相位自动控制 | |||
| automatic frequency and phase control: 4 phrases in 3 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Geophysics | 2 |
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