说明：  PDF分解和合并软件，是用于对PDF文件进行分解和合并，图形用户界面提供了选择文件和设置选项等功能
(PDF Split and Merge is an easy to use tool to merge and split pdf documents. Console and GUI versions are available. The GUI is written in Java Swing and it provides functions to select files and set options. It s made over the iText library. )