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DE?? ??
?? 21??? ?? ??? ??? ??? ??.
?? ???? ?? ??? ??? ??? ??? ????: ?? ??, ?? ??, ?? ??, ?? ??.
Professional Standard - Ferrous Metallurgy, ?? ??
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ??
Professional Standard - Machinery, ?? ??
Japanese Industrial Standards Committee (JISC), ?? ??
Korean Agency for Technology and Standards (KATS), ?? ??
KR-KS, ?? ??
American Society for Testing and Materials (ASTM), ?? ??
未注明發(fā)布機(jī)構(gòu), ?? ??