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DE?? ??
?? 8??? ?? ??? ??? ??? ??.
?? ???? ?? ??? ??? ??? ??? ????: ?? ?? ???, ????, ????, ????, ?? ??.
YU-JUS, ?? ??
Professional Standard - Non-ferrous Metal, ?? ??
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ??
Professional Standard - Ferrous Metallurgy, ?? ??
American Society for Testing and Materials (ASTM), ?? ??
European Committee for Standardization (CEN), ?? ??