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DE? ??
?? 4??? ? ??? ??? ??? ??.
?? ???? ? ??? ??? ??? ??? ????: ??, ?? ? ? ??, ?? ? ??.
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ? ??
CZ-CSN, ? ??
Group Standards of the People's Republic of China, ? ??
Hunan Provincial Standard of the People's Republic of China, ? ??