发布时间:2025-01-30 14:53:07
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
在一条街道上租了个门面做糕点卖菜街道上早晚都卖菜旁边有ktv门面怎样装修好看
2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07请教各位大虾装修时为了厕所排气的需要在厕所窗户上方打洞结果打断钢筋请问如何补救
2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07 2025-01-30 14:53:07