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GSO, ?? ??? ?? ??

Korean Agency for Technology and Standards (KATS), ?? ??? ?? ??

Professional Standard - Water Conservancy, ?? ??? ?? ??

Professional Standard - Environmental Protection, ?? ??? ?? ??

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

VN-TCVN, ?? ??? ?? ??

Professional Standard - Electricity, ?? ??? ?? ??

PL-PKN, ?? ??? ?? ??

KR-KS, ?? ??? ?? ??

SCC, ?? ??? ?? ??

American Society for Testing and Materials (ASTM), ?? ??? ?? ??

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

Danish Standards Foundation, ?? ??? ?? ??

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

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ??? ?? ??

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

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





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