发布时间:2025-02-03 20:59:45
建筑中一期、二期、三期是指。一般工程项目比较大时,要分期完成。如一个项目有8百万平米,一期施工1百万,那么就是8期。
hdpe双壁波纹管规格型号 hdpe双壁波纹管外径和内径有什么区别
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