GB T 19472.1-2019 埋地用聚乙烯（PE）结构壁管道系统 第1部分：聚乙烯双壁波纹管材.pdf

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GB T 19472.2-2004 埋地用聚乙烯(PE)结构壁管道系统 第2部分;聚乙烯缠绕结构壁管材.pdf

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