发布时间:2025-01-17 15:59:02
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。
我是想买二胡我其实就懂看看二胡的颜色好不好看其他的什么材料那些我都不懂什么材料的好啊
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