每一根金属立杆都必须接地,其接地电阻小于4欧;各立杆基础具体数据视现场施工需要为准。
Every metal stud must be ground, the grounding resistance less than 4 o;The vertical bar for concrete data depending on the site construction need to shall prevail.
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19 公路道路护栏 隔离栏_钣金厂家_基本资料信息
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每一根金属立杆都必须接地,其接地电阻小于4欧;各立杆基础具体数据视现场施工需要为准。
Every metal stud must be ground, the grounding resistance less than 4 o;The vertical bar for concrete data depending on the site construction need to shall prevail.