发布时间:2025-02-05 22:09:17
伟星PE管材
按原料分为PE80和PEPE100,PN表示水管公称压力,SDR表示外径与壁厚之比。。
比如PE 80 PN0,.4 SDR21 D110*18.5(110表示外径,18.5表示壁厚)....
根据建筑设计防火规范gb 5001620142018年版规定下列建筑中属于一类高层公共建筑是
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