说明：  Protel 99 SE是当今最流行的电子电路计算机辅助设计（电子CAD）软件之一。本书由浅入深系统地介绍了 Protel 99 SE的实用功能,本书可作为大中专院校电子类、电气类、机电类、自动化类、计算机类、信息工程类等专业和相关培训的电子电路计算机辅助设计（电子CAD）课程教材，也可作为从事电路设计工作的技术人员和电了爱好者的参考书。
(Protel 99 SE is one of the most popular computer-aided design of electronic circuits (electronic CAD) software one. Easy-to-digest book systematically introduces the Protel 99 SE practical features, this book can be used as colleges electronics, electrical categories of machinery and electronic, automation categories, computer, information engineering and related professional training, such as electronic circuit computer-aided design (electronic CAD) curriculum materials can also be engaged in circuit design as a work of technical personnel and electricity has been the reference book lovers.)