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| 声响系数 | |||
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acoustical coefficient : 36 phrases in 11 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Compressors | 1 |
| General | 1 |
| Geophysics | 1 |
| Metallurgy | 4 |
| Oil / petroleum | 2 |
| Plastics | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 21 |
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