PWMsignal

说明：  Python是一种计算机程序设计语言。是一种面向对象的动态类型语言，最初被设计用于编写自动化脚本(shell)，随着版本的不断更新和语言新功能的添加，越来越多被用于独立的、大型项目的开发。(Python is a computer programming language. As an object-oriented dynamic typed language, it was originally designed to write automated scripts (shells). With the updating of versions and the addition of new language functions, it is increasingly used in the development of independent, large-scale projects.)

Speech and Language Processing.pdf

公务员的电子试卷，做起来很方便，建议需要试试的同学下载这个软件。(Civil e-paper, make it very convenient, it is recommended the need for students to try to download the software.)

说明：  模拟电子技术的课件，感觉挺有用的，一些基本的理论知识(Analog electronics technology courseware, I feel quite useless, some basic theoretical knowledge)

Ansys Dynamci Analsysi Code - 3

说明：  zhouzhihua machine learning book

citygml详细教程-------很好的学习资料(citygml good detailed tutorial learning materials-------)

gsm coding for alarm system

说明：  SQL语言简明教程 一个学习SQL语言不错的教程 为PDF文件格式 讲述了SQL语言的概貌特点、SQL的数据查询数据定义数据操纵数据控制功能。简明扼要，适合初学数据库者学习、参考。(Concise Guide to the SQL language SQL language learning a good guide to the PDF file format on the SQL language features of a picture, the data query SQL Data Definition Data Control data manipulation functions. Concise, database suitable for beginners learning, reference.)

清华大学CUDA编程教程，能够快速掌握CUDA编程技巧和应用案例(Tsinghua University CUDA programming tutorials, to quickly master the the CUDA programming skills, and the application case)