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DE?? ?? ??
?? 18??? ?? ?? ??? ??? ??? ??.
?? ???? ?? ?? ??? ??? ??? ??? ????: ???, ???, ???, ????, ???, ???, ????.
Henan Provincial Standard of the People's Republic of China, ?? ?? ??
Shanxi Provincial Standard of the People's Republic of China, ?? ?? ??
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ?? ??
Ningxia Provincial Standard of the People's Republic of China, ?? ?? ??
American Water Works Association (AWWA), ?? ?? ??
Association of German Mechanical Engineers, ?? ?? ??
American Welding Society (AWS), ?? ?? ??
British Standards Institution (BSI), ?? ?? ??
Professional Standard - Agriculture, ?? ?? ??
American Society for Testing and Materials (ASTM), ?? ?? ??
Group Standards of the People's Republic of China, ?? ?? ??
CZ-CSN, ?? ?? ??