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?? 7??? ????? ??? ??? ??.
?? ???? ????? ??? ??? ??? ????: ???, ????, ?? ? ?? ??.
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ????
Sichuan Provincial Standard of the People's Republic of China, ????
CN-DB 3, ????
Professional Standard-Safe Production, ????
Group Standards of the People's Republic of China, ????