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DE??? ?? ??? ??
?? 26??? ??? ?? ??? ??? ??? ??? ??.
?? ???? ??? ?? ??? ??? ??? ??? ??? ????: ????, ??, ?? ??, ?? ??, ?? ??, ?? ? ???.
Hebei Provincial Standard of the People's Republic of China, ??? ?? ??? ??
Jilin Provincial Standard of the People's Republic of China, ??? ?? ??? ??
Shandong Provincial Standard of the People's Republic of China, ??? ?? ??? ??
Group Standards of the People's Republic of China, ??? ?? ??? ??
British Standards Institution (BSI), ??? ?? ??? ??
SCC, ??? ?? ??? ??
TR-TSE, ??? ?? ??? ??
AT-ON, ??? ?? ??? ??
Taiwan Provincial Standard of the People's Republic of China, ??? ?? ??? ??
Spanish Association for Standardization (UNE), ??? ?? ??? ??
German Institute for Standardization, ??? ?? ??? ??
PK-PSQCA, ??? ?? ??? ??
Association Francaise de Normalisation, ??? ?? ??? ??
International Organization for Standardization (ISO), ??? ?? ??? ??
API - American Petroleum Institute, ??? ?? ??? ??