Chapter 65: Retreating from Difficulties
Thinking of this, Ning Chen felt that this was indeed very possible.
Compared with physics and chemistry, mathematics is a more purely theoretical subject and does not require any experiments.
But physics and chemistry are different. Many physics and chemistry theories and formulas are derived on the basis of experiments.
In the process of self-study, 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.
"How about entering the laboratory in advance and trying a learning method that combines theory and experiment?"
After making the decision, Ning Chen got in touch with Xu Zhou.
After learning what Ning Chen was thinking, Xu Zhou first asked:
"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 had only read a few books for a few days. If his foundation was too poor, he would have to explain everything by himself when entering the laboratory.
"I have probably learned a little more than half of the professional knowledge, but I feel that I have reached a bottleneck. Maybe it would be better to be exposed to experiments earlier."
Seeing what Ning Chen said, Xuzhou couldn't refuse directly.
"Well, Ning Chen, please come over here first. I will get to know your study situation, and then I will decide whether you are suitable to enter the laboratory now."
"Okay, Xu Teacher, I’ll be there right away.”
After hanging up the phone, Xu Zhou's impression of Ning Chen dropped a lot.
“In just 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, Xuzhou naturally knows the amount of knowledge required in undergraduate materials courses. How big.
Normal undergraduates take about two years 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 will be difficult to master all professional courses in less than a few months.
No matter how talented Ning Chen was in learning, there was no way he could finish half of the courses in just a few days.
Xu Zhou thought, wait a while for Ning Chen to come over, give Ning Chen a few questions at random, so that Ning Chen can quit before he sees the difficulties, or send him back to study for a period of time.
Ning Chen quickly arrived at the laboratory and greeted Xu Zhou politely.
Xu Zhou did not 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 as soon as possible, but you also know that our experiment is not a simple physical and chemical experiment, and has a certain threshold."< br>
"If you don't have enough professional knowledge, many experiments will be difficult to perform, and may be dangerous due to some misoperations."
"In this case, let me test you with five questions first. If you can If you answer three questions correctly, I will allow you to enter the laboratory for internship.”
Ning Chen knew that Xu Zhou might not believe that his learning progress was that fast, but Ning Chen was confident that as long as Xu Zhou mentioned it. If the question is not too difficult, I am still confident that I can answer it.
"Teacher Xu, are the questions you asked in the exam an undergraduate question?"
"Of course, I will definitely not embarrass you."
Seeing Xu Zhou say this, Ning Chen felt relieved.
In fact, Ning Chen has not only read half of the information, but has already roughly read all the information. However, Ning Chen has not thoroughly studied nearly half of the knowledge. .
"Okay, Teacher Xu, please ask." Xu Zhou didn't want to make Ning Chen look too embarrassed, 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 stunned for a moment, and then replied:
"There are body-centered cubes, face-centered cubes, and close-packed cubes."
The reason why Ning Chen was stunned was, It wasn't that he didn't think of the answer right away, but that he didn't expect the first question Xu Zhou asked to be so simple.
Such a simple knowledge, Ning Chen will remember it in his mind 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 been reading seriously these days.
After all, Xu Zhou did not assign any scope to Ning Chen before asking the question. Instead, he raised the question casually from the huge knowledge system of materials 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? Two measures for refining grains are given."
This time, Ning Chen really It took me a few seconds to think about it. After all, my studies in the past few days have been a bit rushed, and the entire knowledge system has not been sorted out clearly.
Of course, Ning Chen quickly searched for the answer to the question in his mind.
“Fine-grain strengthening is a method of improving the mechanical properties of materials by refining the grains. Common refinement measures include modification treatment, increasing cooling rate, vibration and stirring, etc.”
< br>Ning Chen realized that he had mentioned one more way to refine his energy, but there would be no points deduction for promising too much.
Xu Zhou was really surprised to hear that Ning Chen answered his question correctly again.
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 temporarily come up with a more difficult question.
“What are the characteristics and differences between body shape polycondensation reaction and linear polycondensation reaction?”
This question is considered a relatively difficult question even among postgraduate entrance examination questions for materials majors. .
There are only a few students among the candidates who can answer questions of this difficulty.
Xu Zhou did not want to deliberately embarrass Ning Chen, but if he asked Ning Chen to answer another question correctly, he would really have no reason not to let Ning Chen enter the laboratory.
After thinking briefly for a few seconds, Ning Chen replied:
“From the perspective of the monomers participating in the reaction, there is at least one monomer in the body polycondensation reaction that 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.”
< br>"The body shape polycondensation reaction increases as the degree of reaction increases, and the reaction is divided into three stages: A, B, and C..."
Ning Chen answered the whole question very fluently, if this question was not a casual one by Xuzhou Xu Zhou might have thought that Ning Chen already knew 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)