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| acoustic countermeasure | |||
| acoustical countermeasure | |||
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声对抗 : 13 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Space | 2 |
| Technology | 2 |
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