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| 混凝土天花板楼板 | |||
| 混凝土顶板［篷］ | |||
| 混凝土天棚; 混凝土天花板; 混凝土平顶; 混凝土顶棚 | |||
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concrete ceiling : 5 phrases in 1 subject |
| Technology | 5 |
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