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| point source | |||
| point sound source; simple sound source | |||
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| point sound source; simple sound source | |||
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点声源 : 5 phrases in 5 subjects |
| Air defense | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
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