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DE?? ?? ???
?? 32??? ?? ?? ???? ??? ??? ??.
?? ???? ?? ?? ???? ??? ??? ??? ????: ?? ??, ??, ??, ?? ? ??, ?? ? ?? ???, ?? ? ?? ?? ??, ???, ??? ?? ???? ???? ?? ??, ?? ? ?? ??, ??? ??, ?? ??.
German Institute for Standardization, ?? ?? ???
European Committee for Standardization (CEN), ?? ?? ???
International Organization for Standardization (ISO), ?? ?? ???
American Gas Association, ?? ?? ???
Association Francaise de Normalisation, ?? ?? ???
SCC, ?? ?? ???
Group Standards of the People's Republic of China, ?? ?? ???
National Metrological Verification Regulations of the People's Republic of China, ?? ?? ???
Korean Agency for Technology and Standards (KATS), ?? ?? ???
Professional Standard - Agriculture, ?? ?? ???