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????????(????)

?? 3??? ????????(????)? ??? ??? ??.

?? ???? ????????(????)? ??? ??? ??? ????: ?? ??.

Professional Standard - Chemical Industry, ????????(????)

• HG/T 4020-2008 ?? ?? ????????(????)

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ????????(????)

• GB/T 1287-1994 ?? ?? ????????(????)

工業和信息化部, ????????(????)

• HG/T 4020-2020 ?? ?? ????????(????)

??:   ???? ????, ????????(????), ????????(????).