 |
| |||
| 隔声指数 | |||
| 隔声量 | |||
| |||
| 声减弱指数; 隔声量; 声衰减指数 | |||
|
sound reduction index : 3 phrases in 3 subjects |
| Hydroelectric power stations | 1 |
| Nautical | 1 |
| Technology | 1 |
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