发布时间:2025-02-08 00:49:56
取决于固定管托安装位置。 如果是:固定管托——滑动管托————胀力弯——滑动管托————固定管托,蒸汽管道热位移的方向一定是向胀力弯方向位移的。
想知道pvc_u和ppr这两种水管都有什么配件和一般都有多大管径的
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