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DE?? ??
?? 14??? ?? ??? ??? ??? ??.
?? ???? ?? ??? ??? ??? ??? ????: ?? ?? ? ?? ?? ??, ???? ??, ?? ??, ???, ?? ? ?? ??? ?? ?? ??.
Professional Standard - Electron, ?? ??
Hebei Provincial Standard of the People's Republic of China, ?? ??
Professional Standard - Civil Aviation, ?? ??
Professional Standard - Aviation, ?? ??
Group Standards of the People's Republic of China, ?? ??
Professional Standard - Machinery, ?? ??
Anhui Provincial Standard of the People's Republic of China, ?? ??
Jiangsu Provincial Standard of the People's Republic of China, ?? ??
Military Standard of the People's Republic of China-General Armament Department, ?? ??
British Standards Institution (BSI), ?? ??
Professional Standard - Aerospace, ?? ??