SFS 3433-1987 《塑料管 采用松弛法测定环压挺度》.pdf

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BS EN ISO 9969-2016 Thermoplastics pipes Determination of ring stiffness《热塑性塑料管 环压挺度的测定》.pdf

DS INSTA 210-1990 Plastic pipes Determination of ring stiffness Creep method《塑料管 环压挺度测定 松弛法》.pdf

DS INSTA 211-1990 Plastic pipes Determination of ring stiffness Creep method《塑料管 环压挺度测定 蠕变法》.pdf

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