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DE?? ?? ??
?? 23??? ?? ?? ??? ??? ??? ??.
?? ???? ?? ?? ??? ??? ??? ??? ????: ?? ? ??, ??, ??, ???.
Professional Standard - Urban Construction, ?? ?? ??
Group Standards of the People's Republic of China, ?? ?? ??
Korean Agency for Technology and Standards (KATS), ?? ?? ??
SCC, ?? ?? ??
German Institute for Standardization, ?? ?? ??
Danish Standards Foundation, ?? ?? ??
Lithuanian Standards Office , ?? ?? ??
AENOR, ?? ?? ??
PT-IPQ, ?? ?? ??
European Committee for Standardization (CEN), ?? ?? ??
Guangdong Provincial Standard of the People's Republic of China, ?? ?? ??
British Standards Institution (BSI), ?? ?? ??
GSO, ?? ?? ??