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| 吸声石膏顶棚 | |||
| 隔声天花板; 隔声顶棚 | |||
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| 吸声石膏顶棚 | |||
| 隔声天花板; 隔声顶棚 | |||
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acoustical plaster ceiling : 2 phrases in 1 subject |
| Technology | 2 |
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