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With the fast development of economic construction of our country, the safety accident in production is outstanding day by day too, the question of safety in production receives the extensive concerns of the country , government and society more and more, directly subordinate organ as the government sets up the mechanism of safety in production rapidly in the whole country, the safety in production has been laid out the government"s important agenda, but as to new organization of safety in production, difficulty and pressure , opportunity and challenge faced are a lot, how to put the thinking in order in work of thousands of strands and loose ends, catch the focal point, give full play to the role of the government"s supervision and management, turn back the passive state of the safety in production rapidly, it is the focal point that this text discusses.

随着我国经济建设的快速发展，安全生产事故也日益突出，安全生产问题越来越受到国家、政府和社会的广泛关注，安全生产机构作为政府的直属机构在全国迅速建立起来，安全生产工作摆上了政府的重要议事日程，但就新的安全生产机构来说，面临的困难和压力、机遇与挑战是很多的，在千头万绪的工作中如何理清思路，抓住重点，充分发挥政府的监督管理作用，迅速扭转安全生产工作的被动局面，是本文讨论的重点。

Then the boundary element integral equation of interior and exterior form is deduced in detail, also the form with corner coefficient. The significance for numerical calculation and principle of the singular integral is analyzed, and a non-isoparametric transformation method is presented to calculate weak singular integral and Cauchy integral, the method presented provides us a very simple way to computer the two kinds of singular integral of Helmholtz boundary integral equation, and it is easy to program in computer. After the difficulty of the calculation for multi-frequency of Helmholtz boundary element is explained, a method named SECHIEF (Series Expansion Combined Helmholtz Integral Equation Formulation), which is focused on the computational efficiency, is presented.

对结构声辐射的边界积分方程的内部形式与外部形式进行了详细的推导，给出了角点系数的计算方法与边界积分方程的形式，在此基础上，分析了奇异积分产生的原理及其对数值计算的重要性，提出了一种计算奇异积分的非等参(来源：Ae8a8BC论文网www.abclunwen.com)单元的变换方法，该方法给Helmholtz 声学边界积分方程中的弱奇异积分与Cauchy 奇异积分的计算以及编程提供了极大便利。

The Causal Relation Data Mining is a new direction in the Data Mining research field,and it is very useful in the application.The Difficulty of modeling blocks its development.

因果关系挖掘是数据挖掘领域一个新的研究方向，具有很大的实用意义，但理论建模的困难阻碍了它的发展。20世纪90年代，在因果建模研究成果的基础上，国外开始针对此方向进行研究，目前已得到了一些理论算法。

Analysts say a key reason for Toyota's cautiousness in India has been the difficulty of mass-market producing while maintaining a reputation for reliability and safety.

分析师表示，丰田汽车对印度市场持谨慎态度的一个关键原因是难以在面向印度普通大众生产的同时维系其产品安全可靠的声誉。

On the current importance of his equipment, Riquelme emphasized the difficulty of a rival as the Celt of Vigo from which it hopes that it complicates the things in The Madrigal, in the meeting league of next Sunday.

说到他所在的球队的现状，里克尔梅觉得在下周日在El Madrigal联赛的对手Celta de Vigo 可能会使情况变得复杂一点。

If there is any difficulty the central government, it can point bonds.

如果有任何困难，中央政府，它可以指向债券。

In the spirit of our time, it's either Anna or Karenin who is right, and the ancient wisdom of Cervantes, telling us about the difficulty of knowing and the elusiveness of truth, seems cumbersome and useless.

对于我们时代的精神来说，正确的不是安娜，就是卡列宁。而来自塞万提斯的古老智慧----这些智慧告诉我们认知是困难的，真理是难以捕捉的----看上去笨拙且无用。

But for the demand that expands to guild at modern society relatively, association of trade of cervine city shoe still is existing independent character not strong, function is diseased, exterior the environment is undesirable, in-house the orgnaization is not complete and problem and the difficulty such as lack of professional working personnel.

但相对于现代社会对行业协会发展的要求来说，鹿城鞋业协会还存在着独立性不强、功能不健全、外部环境不良、内部机构不全以及专业工作人员缺乏等问题和困难。

The allocation theory is an important part of CET, and is also a problem with difficulty.

分配理论是积累〓理论的重要组成部分，也是研究的难点。

The dynamic equation of motion chain is a group of high non-linear differential equations, the solution is difficulty.

锚泊线的运动方程是一组高非线性的偏微分方程组，求解困难。

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。