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| 消声器 | |||
| 声阻尼装置; 声学吸收器 (利用声学特性抑制喷气机振荡燃烧的装置); 消音器 | |||
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acoustic absorber : 6 phrases in 2 subjects |
| Shipbuilding | 1 |
| Technology | 5 |
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