Unit One Power Quallty
　PartⅠ Reading Comprehension
　PartⅡ 词义的选择
　PartⅢ 求职信
Key to Unit One
Unit Two Security of Power Application
　PartⅠ Reading Comprehension
　PartⅡ 词义的引申
　PartⅢ 履历表
Key to Unit Two
Unit Three Substations
　PartⅠ Reading Comprehension
　PartⅡ 词类转译法
　PartⅢ 商业信函
Key to Unit Three
Unit Four Reactive Power and Power Factor
　PartⅠ Reading Comprehension
　PartⅡ 词的增加译法
　PartⅢ 广告