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| 吸音材料 | |||
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| 吸隔声材料 | |||
| 声学材料; 消声材料; 隔声材料; 吸声材料 | |||
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| 吸音材料 | |||
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sound- absorbent material : 2 phrases in 1 subject |
| Technology | 2 |
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