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国标双壁波纹管

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国标双壁波纹管
作者：stangang 来源：未知 时间：2020-03-30 17:28

 
国标双壁波纹管执行标准，GB/T19472.1-2004  环刚度，环柔度，口径，外观尺寸，冲击，随机抽检包合格！
 

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