After operation , t he annual sales income can reach 624 million yuan , income tax of 55 million yuan , profix after taxes of 111 million yuan . investment rate of profit and taxes is 21 . 7 % , internal profit rate befove taxes of 20 . 7 % , payoff period of 6 . 5 years . the profit and loss balance point is low and the project has stronger ability against risks 六经济和社会效益估算投产后，年销售收入62397万元，所得税5455万元，税后利润11076万元。投资利税率21 . 7 % ，内部收益率税前20 . 7 % ，投资回收期税前6 . 5年，盈亏平衡点低，具有较强的抗风险能力。
I have taken impotance to analyze the rallying point of famous product , concrete cost and capability of providing and guarantee in this artical , meanwhile , i have caculated the quantity of concrete needed for the year and got the regression equation with the historic data for drilling footage of eight years and the consuming quantity of oilwell cement by the method of linear regression , and it has very significance for the making of stock contract and the plan of concrete production , i have analyzed the physical distribution of oilwell cement by the transpotation flex and the advantage or disadvantage between direct distribution and distribution to store in this artical , and i have tried to find the balance point of the two distribution ways by the ecnomic analysis and pointd out the conception of economic semidiameter , and come to the conclusion of direct distribution , distribution to store , and subarea of distribution to store at last 本文对油井水泥供应商在品牌号召力、水泥成本、供应保障能力等方面进行了详尽分析,并对供应商进行了能力排序;用线性回归方法从八年钻井进尺与油井水泥消耗量的历史数据推算了当年度油井水泥需求量,得出了回归方程,这对于油井水泥采购合同的制订、水泥供应商生产计划的制订具有相当重要的意义;从运输弹性分析出发对油井水泥物流配送进行了研究,对直达配送、入库配送的优缺点进行了详细的分析,在经济分析的基础上力求找到两种配送方式的均衡点,并提出了经济半径的概念,得出了直达配送、入库配送、入库分区距离等几项结论。
By analyzing the suitability for the physiological properties of mushroom and the packaging materials , we establish the mathematic model regarding the relationship between the mushroom respiration and the permeation of packaging material at the movement - state balance point , which can provide some theory basis for the fresh - keeping packaging 摘要通过对新鲜食用菌生理特性和包装材料渗透性能的分析和研究，以及食用菌的保鲜包装实验，初步探讨并建立了食用菌呼吸与包装材料渗透性达到动态平衡时的数学模型，为食用菌的保鲜包装中材料选择及工艺制定提供指导。
This paper also tested each model and system - the second loop of qinshan nuclear power station ( the second term ) ， computed the balance point ， tested the performance of step disturbance and runback loads for system ( no adding adjustment system ) ， analyzing the factors effecting the first tiptop rotate speed of turb and time which the rotate speed reach the tiptop 在仿真模型上，完成了稳态计算、系统阶跃扰动试验、甩负荷试验(未加调节系统)等测试，主要监控和分析了汽轮机动态特性中两个重要参数：汽轮机第一飞升转速、飞升时间。
