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管接头和阀门热处理设备都选的304材质而不是316? |
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|Archiver|手机版|小黑屋|热处理之家 ( 湘ICP备16021836号-4 ),中华人民共和国工业和信息化部备案号:湘ICP备16021836号-1, 湘ICP备16021836号-3, 湘ICP备16021836号-4, 公安部备案号:43010302000896
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