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? Electrotechnics (4th Edition) is a national general higher education planning textbook during the 12th Five-Year Plan period, and is an iCourse textbook recommended by the Lecture Hall of Electrical Masters in Colleges and Universities. It is edited by Shi and published by Higher Education Press, May 1. This book can be used as a teaching material for non-electrical majors in colleges and universities to study electrotechnics, and also as a reference book for students and social readers who study electrotechnics through large-scale open online courses.