JUS C B5 305-1990 Pipevvork Double overlap flexible metal hoses (asbestos packing leakproof circular section in ausieni-tic stainless steelj《管道工程 双层重叠式柔性金属软管（奥氏体不锈钢壁内环形截面的密封石棉胀环型）》.pdf

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