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| 半防火木结构 | |||
| 半防火木结构楼层木梁厚度不小于6英寸 | |||
| 半防火结构 (楼层木梁厚度不小于6英寸); 工厂建筑; 耐火木结构; 耐火构造; 厂房结构 | |||
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mill construction : 2 phrases in 1 subject |
| Technology | 2 |
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