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DE????? ???? ?? ??
?? 20??? ????? ???? ?? ??? ??? ??? ??.
?? ???? ????? ???? ?? ??? ??? ??? ??? ????: ?? ?? ???, ?? ??, ???, ??? ???.
國(guó)家市場(chǎng)監(jiān)督管理總局、中國(guó)國(guó)家標(biāo)準(zhǔn)化管理委員會(huì), ????? ???? ?? ??
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ????? ???? ?? ??
AENOR, ????? ???? ?? ??
Professional Standard - Ferrous Metallurgy, ????? ???? ?? ??
American Society for Testing and Materials (ASTM), ????? ???? ?? ??
Association Francaise de Normalisation, ????? ???? ?? ??