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Standard is the outcome of civilization and progress in human society.The practices of standardization have been carried out since the ancient times,ranging from the uniform track width and handwritten characters in the Qin Dynasty(221 B.C.to 207B.C.)to the large-scale industrial production in modern times.The standardization level reflects the
Standard is the outcome of civilization and progress in human society. The practices of standardization have been carried out since the ancient times, ranging from the uniform track width and handwritten characters in the Qin Dynasty (221 BCto 207B.C.) to the large -scale industrial production in modern times. The standardization level reflects the