对几个典型国家和地区(美国、欧洲和日本)开发并采用的几种有代表性的行驶工况做了全面的介绍；接着，对它们各自的特征进行深入的研究和对比；最后得出几点结论。(A comprehensive introduction to several typical driving conditions developed and adopted by several typical countries and regions (USA, Europe and Japan); Then, the research