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The papers main contents come from the science research named the Structure Optimizing and Working Action Simulating Research of Down-hole Packer that are developed by South West Petroleum Institute and JiangHan Oil Withdrawal Technology Research Institute that is a subcompany of China Petrochemical Corporation in JiangHan oil field.

本论文的研究工作是中国石化集团江汉油田分公司采油工艺研究院与西南石油学院合作开发的科研课题&井下封隔器结构优化及工作行为仿真研究&的主要内容。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。