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| 地面排水 | |||
| 地板排水装置 | |||
| 楼面疏水 | |||
| 地面排水口 | |||
| 楼面排水; 地面排水 (管); 地漏; 地板面排水 | |||
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| 建筑物地面疏水 | |||
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floor drain : 6 phrases in 3 subjects |
| Electronics | 3 |
| Nuclear and fusion power | 2 |
| Rail transport | 1 |
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