最新定义的自然垄断的特点是代表性企业成本函数的弱增性。
The characteristic of the natural monopoly of the latest definition is the cost subadditivity.
第五，选取软件产业中代表性企业进行案例演示，为模型提供例证。
Fifth, this paper supplies two case presentations as examples of the model.
数控系统和其他数控机床功能部件辽宁省也有一定基础，拥有一批代表性企业。
Liaoning province has certain advantages of producing numerical control system and other function units of numerically controlled machine tool and has a batch of representative enterprises.
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