发布时间:2025-01-20 03:01:55
一般HDPE双壁波纹管dn来表示口径尺寸的,比如你说400指的是dn400,
而DN是公称通径,公称通径(或叫公称直径),就是各种管子与管路附件的通用口径。同一公称直径的管子与管路附件均能相互连接,具有互换性.它不是实际意义上的管道外径或内径,虽然其数值跟管道内径较为接近或相等;
dn400口径的双壁波纹管国标尺寸的内径为400mm±5mm。
盖一个100平方的平房需要多少砖多少水泥多少人工最主要需要多少钱谢谢
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