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DE?? ???
?? 13??? ?? ???? ??? ??? ??.
?? ???? ?? ???? ??? ??? ??? ????: ??????, ??? ??, ??? ???, ????.
國家鐵路局, ?? ???
European Committee for Standardization (CEN), ?? ???
CZ-CSN, ?? ???
Professional Standard - Machinery, ?? ???
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ???
American Society for Testing and Materials (ASTM), ?? ???