该文档描述了Ajax的定义，以及如何进行数据与数据交互的主要实现方式。其中包含图形化界面的指导。对于初学者有一定的帮助。-This document describes the definition of Ajax, and how the data and the main way to achieve data exchange. Which contains the graphical interface guidance. Be helpful for beginners.

java文件的读写的定义，读写的几种方法，以及文件相关操作-java file read and write the definition of several methods of reading and writing, and file related operations

Concepts Of EMI and EMC Noise is any electrical signal present in a circuit other than the desired signal. This definition excludes the distortion products produced in a circuit due to nonlinearities. Although these distortion products may be undes