镀锌管标准,镀锌管标准gb/t3091-2015

镀锌钢管国标壁厚是多少？镀锌钢管国标厚DN15-国标厚度2.75，DN20-国标厚度2.75，DN25-国标厚度3.25，DN3...

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#镀锌管标准