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DE?? ???? ??
?? 5??? ?? ???? ??? ??? ??? ??.
?? ???? ?? ???? ??? ??? ??? ??? ????: ?? ??, ??.
German Institute for Standardization, ?? ???? ??
Natural Gas Processor's Association (NGPA), ?? ???? ??
U.S. Air Force, ?? ???? ??
Professional Standard - Agriculture, ?? ???? ??