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DE?? ???
?? 7??? ?? ???? ??? ??? ??.
?? ???? ?? ???? ??? ??? ??? ????: ??? ??, ??? ? ???, ?? ??.
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ???
RO-ASRO, ?? ???
European Committee for Standardization (CEN), ?? ???
German Institute for Standardization, ?? ???
Professional Standard - Non-ferrous Metal, ?? ???