北京快3走势图

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1寸镀锌管外径是多少毫米?

  1寸镀锌管外径是多少毫米?1寸镀锌管外径:33.7mm 内径:要看管壁厚度(2.8mm-3.2mm);内径是(28.1mm-27.3mm)。
1寸镀锌管外径是多少毫米?

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