Starting from a top student and marching towards the sea of ​​stars

Chapter 65 Retreat
Thinking of this, Ning Chen felt that this was indeed very possible.

Compared with physics and chemistry, mathematics is a more purely theoretical subject that does not require any experiments.

But physics and chemistry are different. Many theories and formulas in physics and chemistry are derived on the basis of experiments.

In the process of self-study before, Ning Chen had not participated in any experiments.

Even though Ning Chen's powerful brain could understand the principles of the entire experiment through data, there were many things that experiments could not replace.

"Why don't you enter the laboratory early and try the learning method combining theory and experiment?"

After making a decision, Ning Chen got in touch with Xu Zhou.

Knowing what Ning Chen was thinking, Xu Zhou first asked back:
"Ning Chen, how have you been studying in your materials major these days?"

Xu Zhou didn't want Ning Chen to enter the laboratory so early. After all, Ning Chen hadn't read a book for a few days. If his foundation was too poor, he would have to explain everything when entering the laboratory.

"I have probably learned more than half of the professional knowledge, but I feel that I have entered a bottleneck. Maybe it would be better to get in touch with experiments earlier."

Seeing what Ning Chen said, Xu Zhou couldn't refuse directly.

"In this case, Ning Chen, please come over here first. I will get to know your study situation, and then I will decide whether it is suitable for you to enter the laboratory now."

"Okay, Teacher Xu, I'll be there right away."

After hanging up the phone, Xu Zhou's impression of Ning Chen dropped a lot.

"In a few days, you can complete more than half of the undergraduate professional courses by yourself? What a joke!"

As a teacher majoring in materials, Xu Zhou naturally knows how much knowledge there is in materials major courses at the undergraduate level.

It takes about two years for normal undergraduates to complete all professional courses.

Although students have to learn more than just professional courses in the past two years, even if the time is compressed, it is difficult to master all professional courses in less than a few months.

No matter how strong Ning Chen's learning talent is, it is absolutely impossible to finish half of the courses in these few days.

Xu Zhou thought, wait for Ning Chen to come over later, and give Ning Chen a few random questions, so that Ning Chen can back down, and send him back to study for a while.

Ning Chen soon came to the laboratory and greeted Xu Zhou politely.

Xu Zhou didn't show his opinion of Ning Chen just now, and asked Ning Chen to sit down politely.

"Ning Chen, I know how you want to enter the laboratory sooner, but you also know that our experiment is not a simple physical and chemical experiment, and has certain thresholds."

"If there is not enough professional knowledge, many experiments are difficult to get started, and there may be dangers due to some misoperations."

"Well, let me test you with five questions first, and if you can answer three correctly, I will allow you to enter the laboratory for internship."

Ning Chen knew that Xu Zhou might not believe that his study progress was so fast, but Ning Chen was confident that as long as the questions Xu Zhou asked were not too difficult, he was still confident that he could answer them.

"Mr. Xu, are the questions you tested within the scope of undergraduate studies?"

"Of course, I will definitely not make things difficult for you."

Seeing what Xu Zhou said, Ning Chen felt relieved a lot.

In fact, Ning Chen has not just read half of the materials, but has already read all the materials roughly, but Ning Chen has not thoroughly studied nearly half of the knowledge.

"Okay, Teacher Xu, you can ask." Xu Zhou didn't want to embarrass Ning Chen too much, so he asked Ning Chen a relatively simple question first.

"How many common lattices are there in metal crystals?"

Hearing this question, Ning Chen was taken aback for a moment, then replied:
"There are body-centered cubes, face-centered cubes, and close-packed cubes."

Ning Chen was stunned for a moment, not because he didn't think of the answer immediately, but because he didn't expect the first question Xu Zhou asked to be so simple.

With such simple knowledge, Ning Chen will remember it in his heart at a glance.

Hearing Ning Chen's answer, Xu Zhou also nodded.

Although this question is simple, it at least proves that Ning Chen has really been reading seriously these days.

After all, before asking the question, Xu Zhou didn't give Ning Chen any scope, but randomly asked the question from the huge knowledge system of material science.

But Xu Zhou was not going to let Ning Chen answer the next question easily.

"Yes, the first question is answered correctly. The next question: what is fine-grain strengthening? Give two measures to refine the grain."

This time, Ning Chen did spend a few seconds thinking about it. After all, the study these days has been a bit rushed, and the entire knowledge system has not been organized very clearly.

Of course, Ning Chen quickly found the answer to the question in his mind.

"Fine grain strengthening, that is, a method of improving the mechanical properties of materials by refining grains. Common refinement measures include modification, increased cooling speed, vibration and stirring, etc."

Ning Chen realized that he said one more way to refine his energy, but if he said too much, he wouldn't lose points.

Hearing that Ning Chen answered his question correctly again, Xu Zhou was really surprised.

Xu Zhou knew that even if the same question was asked to an undergraduate who had completed professional courses, he might not be able to answer it accurately.

Ning Chen answered two questions correctly in a row, which forced Xu Zhou to improvise a more difficult question.

"What are the characteristics and differences between body-shaped polycondensation reaction and linear polycondensation reaction?"

Even if this question is placed in the postgraduate entrance examination interview questions for materials majors, it is considered a relatively difficult question.

Students who can answer such difficult questions are only a small number of candidates.

Xu Zhou didn't want to deliberately make things difficult for Ning Chen, but if he could get Ning Chen to answer another question correctly, he would have no reason not to let Ning Chen enter the laboratory.

After thinking for a few seconds, Ning Chen replied:
"From the point of view of the monomers participating in the reaction, at least one monomer in the polycondensation reaction has three or more energies, while the monomers in the linear polycondensation reaction are bifunctional."

"From the structure of the obtained product, the linear polycondensation reaction produces soluble linear molecules, and the body-shaped polycondensation produces insoluble body-shaped molecules."

"The body shape polycondensation reaction increases with the degree of reaction, and the reaction is divided into three stages: A, B, and C..."

Ning Chen's answers to the whole question were very fluent. If Xu Zhou hadn't randomly asked this question, Xu Zhou might have thought that Ning Chen had known the question in advance and memorized the answer.

Seeing that Xu Zhou was stunned and didn't speak, Ning Chen tried to ask:

"Teacher Xu, what about the remaining two questions?"

(End of this chapter)