车牌上的汉字是省、自治区、直辖市简称,第一个字母表示该省的市、地区、自治州等地级或副省级的行政区、其中“a”表示省会城市。 “川a”表示成都市 川c 自贡市 川d 攀枝花市 川e 泸州市. 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.
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