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De Facto Segregation: Ap Human Geo'S Hidden Truth - hm3rp1n
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管道标注dn、de、、φ、d、d区别: dn是指管道的 公称直径,注意:这既不是外径也不是内径,是外径与内径的 平均值,称平均内径。如:dn200~φ219×6 d一般指管道内径。 d 混凝土 … Explore over 350 million pieces of art while connecting to fellow artists and art … · 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到,上网 … Ger为德国的英语简称,德国(英语:germany),而de是德语deutschland的简称。 德语deutschland,意思是德意志人的土地,起初为diutisciu land,来自deutsch,由古高地德语 … Deviantart is where art and community thrive.