Taking PHP and MYSQL as main development kits, the paper presents work principle and the realization method of a new online examination system.

本文是在PHP平台及MYSQL强大功能的基础上，对一种新型的网络在线考试系统的设计原理及具体的实现手段进行探讨。

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The core module in this system is high speed micro controller 89c56, in this paper has introduced the characteristic of this chip and the examination principle of this system.

系统的核心模块为高速微控制器89c56，文中详细介绍该芯片的特点和检测原理。

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This paper mainly discusses the operation principle of hydraulic disc brake, the constitution of on-line examination and the designs of electric circuit, machine and software partial.

主要论述了液压盘式制动器的工作原理和在线检测系统的组成，以及检测系统电路原理、机械部分和软件部分的设计。

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