发布时间:2025-02-03 16:09:09
DN250是说管件的公称通径是DN250,换算成外径就是Φ273mm,8.0表示管件的厚度,综合翻译就是外径*厚度Φ273*8.0的管件【(河北卓硕管道)】
如何在展馆策划中实施高效的顶层设计以确保策划方案在战略层面取得最优化的推进
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