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Group Standards of the People's Republic of China, ???? ???

Hebei Provincial Standard of the People's Republic of China, ???? ???

國家市場監督管理總局、中國國家標準化管理委員會, ???? ???

RU-GOST R, ???? ???

工業和信息化部, ???? ???

British Standards Institution (BSI), ???? ???

SCC, ???? ???

CZ-CSN, ???? ???

German Institute for Standardization, ???? ???

International Electrotechnical Commission (IEC), ???? ???

Association Francaise de Normalisation, ???? ???

International Organization for Standardization (ISO), ???? ???

Spanish Association for Standardization (UNE), ???? ???





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