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?? 28??? ???? ??? ??? ??.
?? ???? ???? ??? ??? ??? ????: ??, ?? ?? ???, ?? ? ?? ??? ??, ??, ???? ? ?? ??.
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ???
Professional Standard - Aviation, ???
Professional Standard - Machinery, ???
Professional Standard-Ships, ???
GSO, ???
Korean Agency for Technology and Standards (KATS), ???
SCC, ???
American Society for Testing and Materials (ASTM), ???