In the old roof can be directly on the construction of the waterproofing layer.

屋面可在旧的防水层上直接施工。

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Each layer of the course has its own properties and construction requirements.

课程的每一层都有各自的属性和构建要求。

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Each layer of the course has its own properties and construction requirements.

课程的每一层都有各自的属性和构建要求。

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