发布时间:2025-01-29 19:56:31
确实是有两种的,这里不得不说下,国标和美标的问题了。DN100是指的公称直径,是为了管道工程设计时,方便和管件连接,所以通用的一个叫法就是DN,DN100对应的国标就是108;对应的美标就是114.最好你对一下你的管子是外径是多大的,管件就不易买错了。
实木门跟实木复合门有什么区别,门的两面是复合板的它属于实木门吗
2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31 2025-01-29 19:56:31四间商铺挑高6米想隔成两层卖家具用钢木结构做隔层问下用多大规格钢材合适
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