UDCpCJJ63-2018·~"5J780-2018Technicalstandardforpolyethylene(PE)gaseousfuelpipelineengineering2018-10-18~~2019-03-01~:btTechnicals...
UDCP中华人民共和国行业标准CJJ63-2018备案号J780-2018聚乙烯燃气管道工程技术标准Technicalstandardforpolyethylene(PE)gaseousfuelpipeli...