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DE???????---
?? 18??? ???????---? ??? ??? ??.
?? ???? ???????---? ??? ??? ??? ????: ?? ? ?? ??, ?? ? ?? ??, ?? ??, ?? ??, ?? ??, ??????, ???.
Professional Standard - Education, ???????---
Professional Standard - Machinery, ???????---
Group Standards of the People's Republic of China, ???????---
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ???????---
National Metrological Verification Regulations of the People's Republic of China, ???????---