In the addition of HX to an unsymmetrically substituted alkene, the hydrogen atom adds to the carbon atom of the double bond that already has the greater number of hydrogen atoms and that the X group adds to the carbon having more alkyl substituents. Markovnikov’s rule can be restated by saying that, in the addition of HX to an alkene, the more stable carbocation intermediate is formed

How are molecular structures determined? One way is though the use of spectroscopic methods. Spectroscopy is the study of the interaction of energy with matter. When energy is applied to matter it can be absorbed, emitted, cause a chemical change, or be transmitted

A mass spectrometer produces a spectrum of masses based on the structure of a molecule. It is a spectrum or plot of the distribution of ion masses corresponding to the formula weight of a molecule, fragments derived from the molecule, or both

These spectra are often called carbon magnetic resonance (CMR) spectra or 13C NMR spectra. In some important ways 13C spectra are usually les complex and easier to interpret than proton (1H) NMR spectra

1、什么是信息，信息处理，信息技术。 2、什么是微电子技术，它的作用和意义。 3、通信技术的分类和通信技术的发展前景。 4、计算机信息处理的特点。 5、数字技术基础

一、键盘 1.基本外设. 控制器集成在芯片组中.主板提供接口 2.键盘的分布.排列.108键 （p51） 需求是第一位的!快捷键位... 3.串行接口：AT或PS/2或USB 4.无线键盘. （集成鼠标功能）

文本按一定格式组织起来的、具有相关性的字符流。 字符:是文本的细胞,计算机中用二进制表示字符集与其编码:计算机信息处理的基础

一、软件 1.计算机系统：硬件+软件 2.软件：包含与数据处理系统操作有关的程序、规程、规则、以及相关文档的智力创作

定义：信息系统是一类以提供信息服务为主要目的的数据密集型、人机交互的计算机应用系统

一、网络的组成与分类： 1、网络的三要素 主机(结点) 通信子网 协议及网络软件 一般意义：将异地计算机连接起来的系统(以实现资源共享为目的)