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Chapter 1: Mechanical PrincipleLesson 1: Steel - 介绍钢铁的基本原理Lesson 2: Heat Treatment of Metals - 金属热处理入门Lesson 3: Introduction to Bearings - 润滑轴承的基础Lesson 4: Gears - 齿轮系统简介Lesson 5: Cams - 凸轮机构基础Lesson 6: Springs - 弹簧的基本知识Lesson 7: Dimensio...