本文首先讲述了爱丽舍转向系的整体结构；具体介绍了它的功用；分类和工作原理。
First described in this paper of the Elysee to the overall structure of concrete introduced its function; classification and principle.
介绍了各种空压机的分类和工作原理及其性能特点和空压机的选用原则。并且讨论了如何确定空压机的流量和压力。
Classification, work principle and performance of various air compressor, choice principle of air compressor are introduced in the paper. And how to determine flux and pressure is discussed.
主要阐述了入侵检测系统对计算机安全系统的重要性、入侵检测系统的分类和工作原理，并针对入侵检测系统的发展趋势展开了讨论。
The importance of the IDS for the computer security system is presented. The classification and working principles of the IDS are analyzed. The development trend of the IDS is discussed.
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