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DE?? ??? ??
?? 13??? ?? ??? ??? ??? ??? ??.
?? ???? ?? ??? ??? ??? ??? ??? ????: ?? ?? ???, ??.
American Society for Testing and Materials (ASTM), ?? ??? ??
GSO, ?? ??? ??
Korean Agency for Technology and Standards (KATS), ?? ??? ??
SCC, ?? ??? ??