【Key words】 optimal control； system theory； numerical calculate； town water supply；
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It is a very efficient tool to numerical calculate partial differential equations on any shape of domain.
它是在任意形状的区域上求偏微分方程的数值解的一种非常有效的工具。
By plasticity increment theory, the stress strain numerical calculate methods of bellows bulge forming, solvers theory calculating problems of bellows bulge forming technology are put forward.
采用塑性增量理论，建立了波纹管液压胀形的应力、应变数值计算方法，解决了波纹管液压胀形工艺的理论计算问题。
Such courses, Hacker argues, are a remedy for the numerical illiteracy of adults who have completed high-level math like algebra but are unable to calculate the price of a carpet by area.
哈克认为，这样的课程可以弥补成年人在数字方面的盲点，这些人已经完成了像代数这样的高级数学，但却无法按面积计算出一块地毯的价格。
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