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DE?? ?????
?? 9??? ?? ?????? ??? ??? ??.
?? ???? ?? ?????? ??? ??? ??? ????: ???.
Professional Standard - Petroleum, ?? ?????
American Society for Testing and Materials (ASTM), ?? ?????
American Petroleum Institute (API), ?? ?????
RO-ASRO, ?? ?????
Spanish Association for Standardization (UNE), ?? ?????
BE-NBN, ?? ?????
Association Francaise de Normalisation, ?? ?????