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Professional Standard - Machinery, ?? ????

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ????

Professional Standard - Automobile, ?? ????

國家市場監督管理總局、中國國家標準化管理委員會, ?? ????

Military Standard of the People's Republic of China-General Armament Department, ?? ????

Professional Standard - Railway, ?? ????

國家鐵路局, ?? ????





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