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| acoustic ratio; acoustical ratio | |||
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声波比 : 33 phrases in 10 subjects |
| Air defense | 2 |
| Computer networks | 1 |
| Construction | 1 |
| Electronics | 11 |
| General | 2 |
| Geophysics | 4 |
| Information technology | 2 |
| Space | 4 |
| Technology | 4 |
| Telecommunications | 2 |
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