发布时间:2025-01-30 14:37:14
DN适用于所有管材一般是钢管,是指管道的公称直径,注意:这既不是外径也不是内径,是指平均值。dn主要用作塑料管材,是指管道外径,一般采用dn标注的,均需要标注成外径X壁厚的形式,比如dn400X17.5表示外径400mm壁厚17.5mm
很多人弄不清无框阳台与有框阳台,无框阳台和有框阳台的区别是什么
2025-01-30 14:37:14现在的装修队装修质量参差不齐有什么地方可以找到本地好点的装修工呢
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