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dn40镀锌管外径多大_家居日记
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dn40镀锌管外径多大

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dn40镀锌管外径多大 dn40镀锌管的外径是在48.3毫米左右，内径是在41.3毫米左右。镀锌钢管可以分成电镀锌以及热镀锌，热镀锌的芯层比较厚，并且镀层上面是


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