The paper contrasts the typical eco - environment characters of western region in jilin province with that of chinese ecozone and come to the conclusion that the western region of jilin province is a restorable ecotone 通过引用中国生态环境脆弱带的有关概念及其分布特征，对照吉林省西部突出的生态环境问题，指出该区是典型的可恢复的生态环境脆弱区。
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In the way of implementing software , we adopt three - layer models as the structure of the network management software , we separate the view , the controller and the model using the think of mvc , in this way , the maintenance , the restorable , the expansibility , the flexible and the encapsulate ability of the software is promoted significantly 并在对网管软件所要管理的数据进行分析的基础上进行了数据库系统的设计。对于软件的具体实现,在软件架构上采取三层体系结构,借鉴mvc设计模式思想将显示,控制和业务分开,大大提高了网管软件的可维护性,可修复性,可扩展性,灵活性以及封装性。
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Aiming at the function and performance limitations of traditional special cnc or current pc - based open - structure cnc , a brand - new cnc platform designing scheme of multi - layer open - architecture is presented , based on embedded - mcu calculation and management core , and three kinds of expanding mode of software , hardware and interface . by using double system working ram and boot rom technology , an independent re - development interface is set on the hardware platform to realize customized function ’ s simulations and verifications online , which makes all the expanding or re - configuring on basic cnc platform are all safe and restorable 本文针对传统专用数控系统的结构封闭、交互形式不通用和配置扩展不灵活方面的劣势以及当前pc模式开放结构数控的体积庞大、开放程度不高和实时可靠性不强的局限，创新性地提出了以基本cnc框架+软件、硬件和接口三种扩展形式为特征的层次化开放结构的嵌入式cnc硬件平台，并采用双存储区技术进行了cnc系统在线仿真校验机制和安全保护机制的方案设计。
