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国标双壁波纹管

国标双壁波纹管
作者:stangang 来源:未知 时间:2020-03-30 17:29


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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