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. Mao Jiuyi came to the feudal era with an unknown system that could be exchanged for modern technology. What the hell? Can the Armored Warrior Summoner count as technology? Soon after, the sound of tractors appeared in the fields, the legend of shower gel appeared in the palace, the emperor carefully chewed gum late at night, and inns everywhere began to sell a fizzy black drink. Mao Jiuyi pushed up the flat glasses on his face and taught the students physical chemistry: "You know? This is the basics of immortality."

[The exam has begun. Please prepare well. Please keep your admission ticket properly. If you lose your admission ticket, you will lose your qualification to take the exam. [There are 30 minutes left before the exam starts. Candidates please be ready. The subject of this exam is physics. The difficulty is: the first three multiple choice questions. The exam time is eight days. Li Ran Yimeng, what do you mean? Where is this place, where the first multiple-choice question in the exam actually takes eight days to write? [Friendly reminder: This exam is divided into points, please don't make mistakes. [Examination rooms are now randomly assigned...] [Welcome to the 0743 examination room, the examination rules will be announced below...] ... [This book is a special unlimited flow novel]