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DE??? pH
?? 35??? ??? pH? ??? ??? ??.
?? ???? ??? pH? ??? ??? ??? ????: ??, ??, ?? ? ?? ??, ?? ??, ??? ? ??? ??, ?? ??, ????, ?? ??.
VN-TCVN, ??? pH
GSO, ??? pH
RU-GOST R, ??? pH
Korean Agency for Technology and Standards (KATS), ??? pH
RO-ASRO, ??? pH
Military Standards (MIL-STD), ??? pH
Association Francaise de Normalisation, ??? pH
CZ-CSN, ??? pH
KR-KS, ??? pH
Japanese Industrial Standards Committee (JISC), ??? pH
Group Standards of the People's Republic of China, ??? pH
American Society for Testing and Materials (ASTM), ??? pH
German Institute for Standardization, ??? pH