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1概述近年来，随着科学技术的发展和商业贸易结算的需要，对气体流量仪表的准确度要求愈来愈高，为了准确地实现气体流量计量，科学。公正地开展气体流量量值传递和进行相关的科学研究，世界先进工业化国家均相继建立了全国最高的实物标准，这个实物标准实际上就是一级流量标准
1 Overview In recent years, with the development of science and technology and commercial trade settlement needs, the accuracy of the gas flow meter requirements are getting higher and higher, in order to accurately achieve the gas flow measurement, science. Fairly carry out gas flow rate value transfer and related scientific research, the world’s most advanced industrialized countries have successively established the highest physical standards in the country, the physical standards is actually a flow standard