The economical function of tourism must take the leisure function as the premise and the essence.
旅游的经济功能必须以休闲作用为前提和内核。
The denotation of the economical function of the state, especially the present function, is significant to the definition of the object of economic law.
明确国家的经济职能，尤其是现阶段国家的经济职能，对恰当界定经济法的调整对象具有重要意义。
Based on the objective function, local optimum and iterative method were adopted to get a computer solution on the optimum economical thickness.
对保温设计的目标函数，采用局部求优，逐步迭代的方法，实现了多层保温经济厚度计算机求解。
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