writeas衬衫下面有什么片段1

　　Welcome to Crash Course Organic Chemistry hosted by Deboki Chakravarti. We'll be tackling the notoriously complicated subject of organic chemistry, and hopefully having some fun along the way. 　　In 50 episodes, Dr. Deboki Chakravarti will teach you organic chemistry. This course is based on sophomore-level college material, covering topics from Organic Chemistry I and II. It was ... (展开全部)