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DE4? ???? ? ?? ????
?? 30??? 4? ???? ? ?? ????? ??? ??? ??.
?? ???? 4? ???? ? ?? ????? ??? ??? ??? ????: ??? ?? ??, ?? ?? ??, ?? ? ?? ??, ?? ??, ??, ?? ? ?? ??, ???, ??? ?? ? ??? ?? ?? ? ??? ??, ?? ??, ?? ??, ?? ? ?? ?? ??, ??? ? ?? ??.
Military Standard of the People's Republic of China-General Armament Department, 4? ???? ? ?? ????
Professional Standard - Machinery, 4? ???? ? ?? ????
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, 4? ???? ? ?? ????
HU-MSZT, 4? ???? ? ?? ????
American Society of Mechanical Engineers (ASME), 4? ???? ? ?? ????
PL-PKN, 4? ???? ? ?? ????
RU-GOST R, 4? ???? ? ?? ????
Group Standards of the People's Republic of China, 4? ???? ? ?? ????
National Metrological Technical Specifications of the People's Republic of China, 4? ???? ? ?? ????
Professional Standard - Coal, 4? ???? ? ?? ????
RO-ASRO, 4? ???? ? ?? ????
British Standards Institution (BSI), 4? ???? ? ?? ????
Professional Standard - Construction Industry, 4? ???? ? ?? ????
Association Francaise de Normalisation, 4? ???? ? ?? ????
ESDU - Engineering Sciences Data Unit, 4? ???? ? ?? ????