In the face of network attacks , virus attacks and malicious threats , how to make the electronic information network systems can not be the illegally invasioned , keep the data secure and protect the safe operation of network equipment , has become an issue in hand 面对网络攻击、病毒侵袭和人为破坏等各种威胁,如何使电子政务信息网络系统不被非法入侵,保护数据安全和网络设备的安全运行,成为一个亟待解决的问题。
Among them , the damage due to physical results from formation stress and external force exerted on casing ; chemical damage from corrosion is in the process of casing " s idle and use , and human factor involves incorrect design , manufacturing and operation 其中，套管的物理损坏包括地层力对套管的破坏和施加外力对套管的损坏；套管的化学损坏包括套管闲置被锈蚀和套管使用过程中被腐蚀；套管的人为破坏因素包括设计不当、制造不当和施工不当。
With a porcelain enamel surface over steel , the 3m digital board is designed for the rigors of constant use in corporate , education , legal , production and related environments where low , long - term cost of ownership is an important consideration 与其他解决方案不同， 3m交互智能板设计时考虑了在企业、教育、司法、制造和其他环境下频繁而持续的使用状况，主板采用了陶瓷珐琅表面的钢板材，因而能够经受极高的使用强度甚至一定程度的人为破坏而无需过多维护保养，使得总体拥有成本得到大幅降低。
The prevention and control measures are ; ( 1 ) the world cooperates , and decelerate the global change ; ( 2 ) enhancing the management , and stopping the man - made destruction ; ( 3 ) positively preventing and controlling to alleviate the harm of insect and mice ; ( 4 ) completely supervising and controlling to prevent the forest fire 提出预防和控制灌木林灾害的对策为： ( 1 )全球合作，减缓全球环境变化； ( 2 )加强管理，制止人为破坏； ( 3 )积极防治，减轻病虫鼠害； ( 4 )全面监控，预防森林火灾。
This text proceeds with network psychoanalysis of university students , has proposed a new thinking of network maintenance of the campus , namely improve university students ' network accomplishment , reduce the attempt of campus network of their artificial distruction , in order to raise the possibility attacked by the inside in campus network 摘要从大学生的网络心理分析入手，提出了校园网络维护的一个新思路，即提高大学生的网络素养，减少他们人为破坏校园网的企图，以降低校园网受到内部攻击的可能性。
They are jinfo mountain in nanchuan county ( natural protection section ) , wuling mountain in qianjiang county ( national emphases forest demonstration county which forest cover rate is beyond 50 % ) and zhongliang mountain in beibei county ( artificial destruction is very grave ) . some main land use patterns i . e . woodland , garden , infield , abandon infield , shrub and grassplot are selected in those three sample sites . four aspects on soil fertility index of karst environment under different land use patterns in these three sample sites , are revealed in this paper , by using the field test , indoor measure and analysis , outdoor experiment and field investigation , and the knowledge and technique of soil , ecology , physics and chemistry etc . they are physical characteristic ( effective soil thickness , organic layer thickness , soil texture , water - stable aggregate and soil water etc . ) , chemical fertility ( organism , omni - n , omni - p , omni - k , alkali - nitrogen , available p , available k and rapid available k etc . ) , soil animalcule ( bacteria , fungi , actinomyces and their grosses ) and soil - seed - pool ( plant community diversity index ) in karst ecosystem 本研究以重庆市的南川金佛山(自然保护区) 、黔江武陵山(国家重点退耕还林示范县，森林覆盖率50以上)和北碚中梁山(遭人为破坏严重)典型岩溶区为对象，选择了几种重要的利用方式，包括林地、果园、耕地、弃耕地和灌草坡，采用野外岩溶生态调查和室内试验测量分析相结合的方法，以不同土地利用方式岩溶土壤肥力为重点，对不同土地利用方式土壤肥力特征进行量化分析，找出岩溶土壤肥力差异的主要方面及其根本原因，论文主要从土壤剖面物理退化指标(有效土层厚度、有机质层厚度、质地、团聚体、水分含量等) ，化学肥力退化指标(有机质、全n 、全p 、全k 、碱解n 、速效p和速效k等) ，样地土壤微生物指标(细菌、真菌、放线菌数量及总量)以及样地土壤种子库植物群落多样性等4个方面对重庆典型岩溶区的土壤肥力特征进行了较为详细的分析研究，为岩溶地区士壤资源的合理利用及结构的调控管理提供依据。
