YBFYBF02-2009石油、石化、天然气及相关工业用钢制截止阀和升降式止回阀Steelglobevalvesandliftcheckvalvesforpetroleum,petrochemical,naturalgasandalliedindustries(BS1873:1975(R1990)Specificationforsteelglo
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YBF,02-2009,石油、石化、天然气及相关工业用钢制截止阀和升降式止回阀,02,2009,石油,石化,天然气,相关,工业,钢制,截止阀,升降,止回阀