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DE??? ???? ? ???
?? 7??? ??? ???? ? ???? ??? ??? ??.
?? ???? ??? ???? ? ???? ??? ??? ??? ????: ??? ?? ? ???, ?? ??, ???? ??? ??.
German Institute for Standardization, ??? ???? ? ???
Professional Standard - Coal, ??? ???? ? ???
Professional Standard - Aviation, ??? ???? ? ???
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ??? ???? ? ???