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屋面上的排水沟称为天沟,有两种设置方式,一种是___ 天沟,另一种是用___ 。

填空题
2022-04-02 12:19
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正确答案
利用屋顶倾斜坡面的低洼部位做成三角形断面,专门的槽形板做成矩形天沟

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