The results show : firstly , nr is product of price inelasticity of demand ; secondly , nr and sr can be substituted to a certain extent , but not completely from the perspective of the economics 研究结果表明：天然橡胶属于需求缺乏弹性的商品；从经济学角度证明天然橡胶与合成橡胶在一定程度上可以相互替代。
2.
Analyzes the basic features of a special gis applications and its basic demand , points out the localization of integrated gis platforms and its inelasticity , and presents a spatial data model based on constructed point set storage to satisfy with the demand of the special gis application . 2 分析了一类特殊gis应用的基本特点和基本功能需求，指出了现有gis平台的局限性和对该类应用的不适应性，针对该类特殊的gis应用，创造性地提出了能满足其要求的基于构造点集的全关系型空间数据模型。
3.
In analyzing the research of branch companies performance evaluation of ningxia yinqi group , pointed out the disadvantages and inelasticity of " production value and output " branch companies performance evaluation system type , and also pointed out the solution was establishing the type of " financial and developing " system , which was fit for the stratagems and the organize changing of the group . based on this , the qualitative and quantitative evaluation system and methods on financial benefit , asset operating , sinking ability and developing ability have been built . the system closely centered on the stratagem of subsistence , development and accrual combining with the influences of the performance 在建立下属企业绩效评价体系和方法的过程中，紧紧围绕企业生存、发展、获利的战略目标要求并结合企业绩效的实际影响因素，提出了以财务效益、资产运营、偿债能力和发展能力为主导的定性和定量评价相结合的评价体系和方法，在评价指标的选取上做到互相补充，在评价方法上建立从单一评价到综合评价直至形成整体评价的方式，在定性评价上采取了绝对数、相对数和相互对比评价的方法，在定量评价上结合层次分析法( ahp )等相关评价方法的基础上建立了综合评价模型，适合于计算机软件处理数据以提高评价工作效率。
