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冯.诺依曼体系结构？
计算机处理的数据和指令一律用二进制数表示
顺序执行程序
计算机硬件由运算器、控制器、存储器、输入设备和输出设备五大部分组成
操作系统四个特性？
并发
共享
虚拟
异步
进程有哪几种状态？转换图？
运行态：该进程正在执行。就绪态：进程已经做好了准备，得到处理机就可以开
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数据库基本概念
数据是数据库存储的基本单位。
数据库是长期存储在计算机内、有组织的、可共享的大量数据的集合。
数据库管理系统是位于用户与操作系统之间的一层数据管理软件
数据库系统特点: 1. 数据结构化 2. 数据共享性高，冗余度低，以扩充。 3. 数据独立性高 4.数据由DBMS统一管理和控制
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OSI有哪几层？每层作用？每层协议？从下至上：
物理层作用：确保比特流可以在任意物理介质上传输协议：RJ4、IEEE802.3、CLOCK设备：中继器、集线器数据链路层作用：将源主机网络层的数据传输到目的主机的网络层，在不可靠的物理介质上实现可靠传输，只能在局域网中传输协议：PPP、HDLC、LL
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Welcome to Hexo! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in
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