At the beginning of the Tang Dynasty, in the second year of Zhenguan, Li Sheng crossed over and became a small Taibao in the Tang Dynasty. At this time, Li Shimin, Du Ruhui and others who were attacked by the Turks unexpectedly came to the village. What surprised Li Shimin and others was that this little The things in Taibao's house are very unusual! Li Sheng, what is a chemical reaction? What is an endothermic reaction? Li Sheng: I...