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The damp proof course is a double layer of locally available PE-film.
所谓防潮层，即是由两层当地可获得的聚乙烯薄膜组成。
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Why do we set a horizontal damp-proof course in a wall?
墙体中为什么设置水平防潮层？
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Why do we set a horizontal damp-proof course in a wall?
墙体中为什么设置水平防潮层？
youdao