GOST 550-1975 Seamless steel tubes for petroleum processing and petrochemical industry Specifications《石油加工及石油化学工业用无缝钢管 规范》.pdf

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STAS 9315 1-1980 EQUIPMENTS FOR CHEMICAL AND PETROCHEMICAL INDUSTRY Seimic actions《化学和石油化学工业用的设备 地震作用 》.pdf

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