主要原因

On the base of Conflict Theory, multilevel causal researches had been carried out and conclusions were made that validity repeal is the basic cause of school violence, emotion evocation is the head cause, abreaction is the immediate cause and heavily social control is the "prime criminal" behind-the-scenes.

并且以冲突理论为基础，将校园暴力的原因进行分层研究，从而得出结论：合法性撤销是导致校园暴力的最基本原因；情感的唤起是校园暴力发生的主要原因；"发泄"是校园暴力发生的直接原因，而高度的社会控制则是其幕后的"元凶"。

Results the overall injury prevalence was 4.58 ‰,and in details,the prevalence gender ratio(boys vs. girls) was 3.48. further analysis showed that the injury prevalence among adolescents was associated with the school types. the campus was the main place of injury occurrence (82.8%). incaution was the leading cause for adolescent injuries accounting for 85.5%. the leading four types of injuries were collision (56.9%),falls (28.8%),knife-cutting or sharp weapon hurt (4.7%) and traffic accidents (1.8%). the most common types of injury were fraction (41.6%) and trauma (36.4%).

结果 学生伤害的平均年发生率为4.58‰，男、女生伤害发生率比值为3.48；伤害发生率与校别有较密切的关系；学校是学生伤害发生的最主要场所，占82.8%；不慎是造成学生伤害发生的最主要原因，占伤害发生原因的85.5%；排在前4位的伤害类型依次是碰撞(56.9%)、跌落(28.8%)、切割穿刺(4.7%)、交通事故(1.8%)；伤害性质主要以骨折和外伤为主，分别占伤害数的41.6%和36.4%。

This paper tries to have some innovations in the following aspects:(1) the main cause of our tax revenue depending mainly on turnover tax is short of innovation in system;(2) its innovation in system to impel the rising of income tax in developed counties, which is a good example for us to learn from in the optimization of our tax structure ;(3) the main function of turnover and income tax should be separated according to their characters;(4) the reforms in turnover and income tax should be taken simultaneously, congenially and complementally, although the former will be more progressive while the later more abrupt;(5) the essential function of tax is to raise revenue, but its fair-promoting effect is much more obvious in disbursing than in collecting.

本文力求在以下几个方面有所创新：(1)认为我国税种收入过度依赖流转税的主要原因是制度创新力度不够；(2)认为制度创新是推动发达国家所得税从弱到强的主要原因，提出我国税种结构优化需要在制度上大胆创新；(3)提出根据各个税种的特性，流转税和所得税的主要功能应有所分工；(4)流转税和所得税的改革应双管齐下，以渐进的方式改革流转税，以突变的方式改革所得税，分工协作，优势互补；(5)提出税收的主要功能是筹集收入，税收在征收环节在促进结果公平方面效果甚微，税收在支出环节更能有效促进结果公平。

This paper tries to have some innovations in the following aspects:(1) the main cause of our tax revenue depending mainly on turnover tax is short of innovation in system;(2) it's innovation in system to impel the rising of income tax in developed counties, which is a good example for us to learn from in the optimization of our tax structure ;(3) the main function of turnover and income tax should be separated according to their characters;(4) the reforms in turnover and income tax should be taken simultaneously, congenially and complementally, although the former will be more progressive while the later more abrupt;(5) the essential function of tax is to raise revenue, but its fair-promoting effect is much more obvious in disbursing than in collecting.

本文力求在以下几个方面有所创新：(1)认为我国税种收入过度依赖流转税的主要原因是制度创新力度不够；(2)认为制度创新是推动发达国家所得税从弱到强的主要原因，提出我国税种结构优化需要在制度上大胆创新；(3)提出根据各个税种的特性，流转税和所得税的主要功能应有所分工；(4)流转税和所得税的改革应双管齐下，以渐进的方式改革流转税，以突变的方式改革所得税，分工协作，优势互补；(5)提出税收的主要功能是筹集收入，税收在征收环节在促进结果公平方面效果甚微，税收在支出环节更能有效促进结果公平。

Results The main reason of silicon gel artificial body and brine bottle extraction after augmentation mammoplasty is envelope crispation. The main reason of polymer acrylic gel extraction after augmentation mammoplasty is sclerosis and discomfort of pain. The main reason of injected fat extraction after augmentation mammoplasty is infective liquefaction.

结果：硅凝胶假体及盐水袋隆乳术后取出的主要原因为包膜挛缩、渗漏及破裂；聚丙烯酰胺水凝胶注射隆乳术后取出原因主要为硬结及疼痛不适；脂肪注射隆乳术后取出原因为感染液化。

Regarding the frequent occurrence of speed stalling of boiler axial flow primary fan in the operation of 600 mw unit in china,the cause of speed stalling was analyzed based on the actual measured data.the problem is mainly caused by primary air pipe resistance property variation,which caused the excessive opening of movable blades,the primary fan is working on the condition of higher wind pressure and lower flow.the approaches to reduce the speed stalling of primary fan and preventive measures are put forwa...

针对目前国内600 mw大容量机组锅炉轴流式一次风机运行中失速事故频繁发生的问题，在了解造成轴流式一次风机失速原理的基础上，根据实测数据对一次风机失速原因进行分析。主要原因为一次风管阻力特性的变化，使一次风机动叶开度过大，一次风机工作点处在高风压区低流量的工况点，是造成一次风机失速的主要原因，提出了运行中减少一次风机失速机率的处理方法及预防措施。

It is analysed to the development of the outdoor sport at present and the trend of the outdoor sport in the future,and it is presented by the situation of the sport club in china the person of taking part in the outdoor sport the contest of outdoor sport in china and other countries and the development at present and the trend in the future.in the second part .Problems and resons existed in the outdoor sport in china are analysed ,and the main problems of the weak secure guarantee,the unruled management and regulation.,the weak quality and the lack technic of the outdoor sport goods are summarized. The main reasons of existing those problems are the weaker popularization and spreading and the inadequate professional people in the second part second part which is a road of the whole pasage.

在第二章重点分析了我国户外运动当今的现状与未来的发展趋势，主要从我国户外俱乐部目前的状况、参与户外运动人员与国内户外赛事开展的情况，以及其发展趋势等方面进行论述，在本章第二节中又对我国户外运动现存的问题与原因进行了分析，总结出目前我国户外运动的主要问题有安全保障较差、国内俱乐部组织管理不规范、户外用品质量与高科技含量不高等，而出现这些问题的主要原因是由于普及与推广力度不够、缺乏专业的户外运动人才等方面造成的。

The fracture reasons of high strength PC steel wire are analyzed, it's considered that center segregation, central cavitation, poriness and inclusion are the metallurgical reasons which lead to the facture of PC steel wire and in the rolling process, differential coping quality, microcrack caused by surface defect, abnormal microstructure caused by burnt and improper cooling velocity, the ears on the head of the wire, overlapping of the wire rod itself are the main reasons which lead to the facture of PC steel wire. At the same time, inappropriate pickling, differential phosphorization quality, the bad heat treatment quality, the generation of crack in the improper drawing and transverse crack caused by abnormal laying of the drawing die are also the reasons of the cracking of PC wire.

对高强度PC钢丝断裂原因进行了分析，认为连铸坯的中心偏析、中心缩孔、疏松和夹杂是导致PC钢丝断裂的冶金原因；轧制过程中，较差的修磨质量、表面缺陷导致的微裂纹，过烧以及不适当的冷却速度导致的非正常显微组织，盘条头部的耳子、盘条本身折叠是导致PC钢丝断裂的主要原因；同时，不恰当的酸洗、较差的磷化及热处理质量、不适当拉丝裂纹的产生、拉拔模具安放不正导致的横裂也是PC钢丝断裂的原因。

But in practical operating, overvoltage caused by reignition of the vacuum switching device frequently appears, and it result in damage of the capacitor bank or the switchgear itself. Ensuring the switchgear against reignition and installing a protective device are two main approaches to avoid the phenomenon. In this paper, a study on overvoltage caused by reignition due to capacitor bank switching with the vacuum switching device and its preventive measures are carried out. The main work which has been done and researches are as follows: 1. The producing mechanism of overvoltage and its influence factor are analyzed. It is pointed out that single-phase reignition is the main reason for damage of the switchgear and two-phase reignition is the main reason for damage of the capacitor bank,so overvoltage of single-phase reignition and two-phase reignition are the emphases of prevention. 2. Analysis of the special working condition of the operating switch for capacitor bank is carried out. It indicates that the vacuum switching device is difficult to realize no-reignition under this operation condition, so it is more practical to adopt protection devices. 3. Analyses of protection effect of RC and MOA and their shortages are carried out. It shows that the two methods can only restrain effectively overvoltage caused by single-phase reignition, and they cannot protect the capacitor bank when reignition of two-phase occurs. 4. The operation principle of G-R damping device is analyzed and discussed emphatically.

本文针对真空开关投切电容器组时因重燃而产生的过电压及其防治措施进行了研究，所开展的主要工作和研究结果如下： 1、对过电压的产生机理及其影响因素进行了分析，指出单相重燃是导致开关设备损坏的主要原因，而两相重燃则是导致电容器组损坏的主要原因，因此单相重燃和两相重燃过电压是防护的重点； 2、对电容器组操作开关的特殊运行条件进行了分析，指出在这种运行条件真空开关难于实现不重燃，因此采用保护装置更具有现实意义； 3、对RC与MOA的保护效果和存在的不足进行了分析，指出这两种方法均只能有效抑制单相重燃过电压，而不能在发生两相重燃时保护电容器组； 4、重点对G-R阻尼装置的工作原理进行了分析和讨论，指出该装置接入后线路中将会出现两种频率的高频振荡，而电容器组上的过电压是由这两种振荡共同决定的； 5、根据对上述两种振荡的分析指出存在一个最佳电阻值使得过电压最低，并提出了电容器组电压和最佳电阻值的近似求解方法； 6、使用电气暂态分析软件MATLAB对G-R装置的保护效果进行了仿真计算，证实该装置确实可以有效抑制重燃时的电容器组过电压； 7、根据仿真与近似计算结果的偏差提出了近似计算的修正方法，经过修正后的过电压计算结果与仿真结果吻合较好； 8、对G-R装置中放电装置G与阻尼电阻R的要求进行了分析，指出采用编织电阻和真空间隙可能是最佳选择。

The complexity of bodywork decides variety of it's error. The station and primary factor which cause error is inconstant change and using correlation analysis can find out the primary factor. With an project given, the theory of correlation analysis for dimension variation of bodywork is discussed through correlation analysis and the layer structure of the bodywork,the state in which the error happened can be found out. How to use eigenva...

车体装焊的复杂性决定了误差产生的多因素性，车体制造过程中产生误差的工位和主要因素是不断变化的，采用相关性分析方法从众多的误差根源中准确地发现最主要的误差源；结合工程实践，论述了车体尺寸波动的相关性分析方法的原理，根据测量点的相关性分析和车体焊接工艺的层次结构，可准确地找到产生车体尺寸误差的工位；讨论了如何利用相关系数矩阵的特征值和相应的特征向量判断尺寸波动的模式，指出测量数据的波动主要按最大特征值所对应的特征向量方式波动，引起这种波动的原因是车体误差产生的主要原因，应重点采取措施加以控制；提出了应用计算机进行相关性分析的解决方案。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。