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DEedta ??? ??
?? 44??? edta ??? ??? ??? ??? ??.
?? ???? edta ??? ??? ??? ??? ??? ????: ?? ??, ??? ??, ??? ??, ??, ?? ?? ???.
American Society for Testing and Materials (ASTM), edta ??? ??
Korean Agency for Technology and Standards (KATS), edta ??? ??
British Standards Institution (BSI), edta ??? ??
PL-PKN, edta ??? ??