发布时间:2025-02-03 11:04:42
一般是给上下水,消防水管,电气的管道,燃气管道等等各种管道留的专用井道空间,这些井一般还包括一些表,和检修操作空间
求一个焊管无缝钢管的规格和理论重量表规格表最主要的要包含公寸内径是多少和外径是多少急
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