一、前言未来流量计量的发展趋势是与国家对能源资源发展、提高能源资源利用和对能源计量科学管理的基本国策分不开的。纵观国际风云,天然气、原油争夺愈演愈烈。尤其是进入新世纪以来,各国间战争不断,利用能源控制他国已成为某些大国制约别国发展的手段之一。因此,能源已不仅仅是提高经济效益和增强企业竞争的途径,能源发展已关系国家经济和政治的 I. Preface The future trend of traffic flow measurement is inseparable from the state’s basic national policy of developing energy resources, improving the utilization of energy resources and scientific management of energy sources. Looking at the international situation, natural gas, crude oil battle intensified. In particular, since the beginning of the new century, the constant war among nations and the control of other countries through the use of energy have become one of the means by which some major powers have constrained the development of other countries. Therefore, energy has become more than just a means to increase economic efficiency and enhance competition among enterprises. The development of energy has a bearing on national economic and political