精选优质文档-倾情为你奉上2000第一段Governments throughout the world act on the assumption that the welfare of their people depends largely on the economic strength and wealth of the community. 71) Under modern conditions, this requires varying measures of centralized control and hence the help of specialized scientists such as economists and operational research experts. 72) Furthermore, it is obvious that the strength of a countrys economy is directly bound up with the efficiency of its agricul