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DE?? ??
?? 11??? ?? ??? ??? ??? ??.
?? ???? ?? ??? ??? ??? ??? ????: ?? ? ???, ???, ??, ???? ? ?? ??, ?? ? ??, ??? ??.
Professional Standard - Machinery, ?? ??
Professional Standard - Electricity, ?? ??
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ??
Hebei Provincial Standard of the People's Republic of China, ?? ??
Shandong Provincial Standard of the People's Republic of China, ?? ??
American Welding Society (AWS), ?? ??
Professional Standard - Urban Construction, ?? ??
International Electrotechnical Commission (IEC), ?? ??
WRC - Welding Research Council, ?? ??
National Aeronautics and Space Administration (NASA), ?? ??