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However, although it has the reliability which like on states high, antijamming ability stronger, but works as production environment is too bad, electromagnetic interference specially intense, or installs uses is improper, possibly creates the program error or the operation mistake, thus produces inputs by mistake and causes outputs by mistake, this will be able to create the equipment out of control and the disoperation, thus will not be able to guarantee PLC the normal operation, will have to enhance the PLC control system reliability, on the one hand will request PLC to produce the factory to enhance the equipment the antijamming ability; on the other hand, in the request design, the installment and the use maintenance cause highly takes, coordinates to be able in every way to consummate solves the problem, effectively strengthens the system the resistance to interference.

然而，尽管有如上所述的可靠性较高，抗干扰能力较强，但当生产环境过于恶劣，电磁干扰特别强烈，或安装使用不当，就可能造成程序错误或运算错误，从而产生误输入并引起误输出，这将会造成设备的失控和误动作，从而不能保证PLC的正常运行，要提高PLC控制系统可靠性，一方面要求PLC生产厂家提高设备的抗干扰能力；另一方面，要求设计、安装和使用维护中引起高度重视，多方配合才能完善解决问题，有效地增强系统的抗干扰性能。

VPN technology is an important method to protect confidential communication and maintain network security. This article describes the VPN technology based on IPSec, including its concept, characteristic and principle. At the base of these, in the campus network environment and linux OS, we realize the resource sharing for campus network which lies in separate location and solves the resource sharing problem in the enterprise effectively.

VPN技术是保障机密通信，维护网络安全的重要手段，本文介绍了基于IPSec的VPN技术，讨论了其基本概念、特点及工作原理，在此基础上，以具体的校园网络为应用环境，阐述了在linux平台下，利用VPN技术，实现大学校园异地校区共享校园网络内部资源的过程，有效解决了企业共享内部资源的实现途径问题。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了