In fact, I haven't logged in to my author account for a long time, and I have been busy working after graduation. "Youth" has not given up.
This book is just to compile the chemistry knowledge points for the high school entrance examination for my cousin who does not live in the same city and likes to play with mobile phones.
I decided to write by hand, hahahahaha, maybe it's more comfortable to write by hand, but I don't understand, I always feel uncomfortable with electronics.
Intention: I hope you are free and happy