发布时间:2025-02-05 22:00:10
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)....
钢结构厂房长192米宽124米屋檐高9米门架式结构跨距约20米开间11米每平方造价大概多少
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