HG/T 20592  法兰 PL 20-40 TF1018.600RF./0(B)-5 RFп©Б∙╚п▒Б┬ Б√⌠п©Б∙╚п▒Б√═Б∙╙я▐Б■°п▒Б┬≥Б∙≥п©Б∙╚я├Б∙╔п©Б∙╚п▒Б┬ Б∙░п©Б∙╚п▒Б┬≥Б∙