CECS 206-2006 Technical specification for steel jacket pre-insulated pipeline with vacuum layer《钢外护管真空复合保温预制 直埋管道技术规程》.pdf

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CECS 206-2006 钢外护管真空复合保温预制直埋管道技术规程.pdf

CECS 206-2006 钢外护管真空复合保温预制.直埋管道技术规程.pdf

GB T 38105-2019 城镇供热 钢外护管真空复合保温预制直埋管及管件.pdf

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