摘要
本文从原动力机的发展演变过程，通过对六种主要机型动力性和经济性的分析比较，认为动力机工作形式的发展变化，一方面是由于动力机的功率、效率等动力性的要求，另一方面与燃料的经济性和可持续发展有着密不可分的关系。
The thesis,based on the progress and development of the movers and the analysis of motivity and economy of six main types,is emphasized on the point that the development of movers' operating means is resulted from the efficiency and power requirements of the movers and their close relationship with the fuel economy and sustainable development
