●The OSI (68) model,sometimes also called ISO or 7 layers reference model for communication.has been developed by the International Standards Organization in early 1980's. (68)
【简答题】人们经常说收益递增的存在是国家之间产生摩擦的根源之一,因为每个国家都希望能扩大具有规模经济的行业的生产。依据垄断竞争模型和外部经济模型评述这观点。 It is often argued that the existence of increasing returns is a source of conflict between countries,since each country is be...