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石棉等非金属材料制成的金属的包装的包裹垫圈有用

18-12-23  点击:326 次|文章发布日期: 2017-12-23 20:21:22

  所以焊接法兰安装成本,劳动力成本和辅助成本是高的,因为多于一个的过程。

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