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19 juin 2020 · dn，DN，de，De之间的区别到底是什么？ 本人是新晋给排水工程师，在标注塑料管管径时使用dn，但被前辈教育只能用De，还让我仔细区分这几个的区别，找了很多规范也没有找 … DeviantArt is where art and community thrive. Explore over 350 million pieces of art while connecting to...
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