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DN50 50.8mm. 拓展资料： 管径是指，管壁比较薄时，管外径与管内径相差无几，所以取管的外径与管的内径之平均值当作管径称呼。通常指一般合成材料或是金属质地的管道，且内径较大时才取内径和外径的平均值为管径。 参考资料：百度百科-管径

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