HG/T 20592  法兰 PL 200-16 RFя▄я▒п╠Б∙■я▄Б∙▓п╠Б∙≈я├Б∙·я▄ц╥п╠Б∙╚я├Б∙▓п▒Б■▄Б∙⌡п▒Б■─Б√┬я├Б∙▓п▒Б■▄Б∙⌡п▒Б■�