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DE?? ???
?? 12??? ?? ???? ??? ??? ??.
?? ???? ?? ???? ??? ??? ??? ????: ???? ??, ?, ?? ??, ?? ?? ??.
GSO, ?? ???
SCC, ?? ???
British Standards Institution (BSI), ?? ???
未注明發(fā)布機構, ?? ???
National Metrological Technical Specifications of the People's Republic of China, ?? ???
IN-BIS, ?? ???