电子书是指将文字、图片、声音、影像等讯息内容数字化的出版物和植入或下载数字化文字、图片、声音、影像等讯息内容的集存储和显示终端于一体的手持阅读器。代表人们所阅读的数字化出版物，区别于以纸张为载体的传统出版物。电子书通过数码方式记录在以光、电、磁为介质的设备中，必须借助于设备来读取、复制和传输。
Software Engineering Tutorial.7 principles of software development, agile communication and system engineering
This is example for E-Market to use sequential file instead of database.
C++ Primer, Fourth Edition By Stanley B. Lippman, Josée Lajoie, Barbara E. Moo ........................................
Pro E part about a mechanical piece on done in PRO Engineering sotware
Digital Image Processing(Edward Angel,Rafael C.Gonzalez,Richard E. Woods) Chapter 4 slice
Digital Image Processing(Edward Angel,Rafael C.Gonzalez,Richard E. Woods) Chapter 5 slice
Digital Image Processing(Edward Angel,Rafael C.Gonzalez,Richard E. Woods) Chapter 6 slice