桂林山水甲天下,桂林客运企业对于发动机性能的要求也高于一般的客运公司。桂林骏达运输有限公司(以下简称骏达)是桂林最大的道路运输企业,从事公路客运、旅游客运、城乡客运的车辆共1527辆,其中公营车辆204辆,并全部用于直达快运线路。在国Ⅱ排放时期,骏达的直达快运线路主要使用进口发动机,2008年实施国Ⅲ标准后,玉 Guilin, a landscape of the world, Guilin passenger transport companies for the performance requirements are higher than the average passenger company. Guilin Junda Transportation Co., Ltd. (hereinafter referred to as Junda) is the largest road transport enterprise in Guilin with a total of 1,527 vehicles engaged in road passenger transport, tourist passenger transport and urban-rural transport, of which 204 are public vehicles, all of which are used for direct expressway service. In the country Ⅱ emission period, Junda’s direct express line mainly imported engines, the implementation of national standards in 2008, the jade