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探索技能提升途径需要的资源探索技能提升途 50 径需要的资源如下：探索技能提升途径需要的资源可以包括以下几个方面：时间：技能提升需要投入大量的时间和精力。

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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