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This book is written by an experienced hardware engineer. It uses the practical operation of component on-site inspection and illustrations to very systematically explain practical knowledge such as the identification and labeling of more than ten commonly used electronic components such as resistors, capacitors, inductors, diodes, transistors, etc. It then summarizes the common fault diagnosis technology, quality detection methods, replacement methods and other practical maintenance technologies of these electronic components. Finally, it summarizes a large number of practical components on-site inspection content.