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dn32钢管外径是多少_家居日记
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dn32钢管外径是多少

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dn32钢管外径是多少 dn32钢管外径是42mm、内径是35.5mm，一般内径越小的钢管，它的管壁越厚，但外径大小不变。另外，大家在购买钢管时，要注意看钢管表


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