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DE???? ?? ??
?? 3??? ???? ?? ??? ??? ??? ??.
?? ???? ???? ?? ??? ??? ??? ??? ????: ??, ??? ?? ??, ????, ???, ???, ???.
RU-GOST R, ???? ?? ??
Professional Standard - Non-ferrous Metal, ???? ?? ??
Anhui Provincial Standard of the People's Republic of China, ???? ?? ??