As a student, it always takes a while to get used to it after a vacation. The specific manifestation is that I don't want to get up in the morning, I don't want to listen to lectures in class, and I don't want to study on my own at night.

Seeing that Professor Zhang, who was wearing black-framed glasses and gray hair on the podium, was giving a lecture with a river of mouth, Lu Tao only felt groggy and wanted to sleep when he lay on the table.

It's not that he doesn't want to learn, and it's not because he came back from vacation, but because this Professor Zhang is a well-known lecture in the entire college.

If you really want to use a very vivid sentence to describe Professor Zhang's lecture on the podium, Lu Tao can only think of the sentence "A book at the beginning, and the lecture depends on reading".

But he had to endure it, because this Professor Zhang was the person in charge of the bid evaluation committee.

As the name implies, the bid evaluation committee is a temporary body formed by the representatives of the purchaser and experts in relevant technical and economic aspects in the bidding and government procurement activities, and is responsible for reviewing the bidding documents and putting forward evaluation opinions.

The news that Professor Zhang is the person in charge of the bid evaluation was told to him by Professor Yu, so Lu Tao came to listen to the lecture today, just to understand what kind of person he is.

If you choose to visit directly at a free time, you are likely to be directly turned away, because it is forbidden to communicate privately with the review experts throughout the procurement process, in order to prevent the transfer of interests.

Professor Zhang didn't care about the large number of sleepy students below, or rather, he didn't have a good way to do it.

I lifted the glasses on the bridge of my nose, opened the textbook, looked at it twice, then turned my head to take the chalk and wrote down what I was going to read today's on the blackboard.

After writing a few big characters, Professor Zhang turned his head, first looked at the students below, and then cleared his throat: "Students, today, we are going to talk about the first law of thermodynamics. “

Li Hong is a good boy, and he basically has no part in skipping class, and he is a little funny at this time, he tilted his head to look at Lu Tao who was lying next to him, poked his left hand, and then opened his mouth to learn Professor Zhang's accent.

Lu Tao raised his head, lowered his voice and said seriously: "Listen to the class." ”

Professor Zhang teaches physical chemistry, which is the most difficult subject in chemistry, but in fact, for Lu Tao's future work, as long as he is not admitted to graduate school, he is basically not needed.

So at this time, he didn't have much of the heart to listen to the lecture, and he talked nonsense with Li Hong next to him.

"Listen, it's not all read from the textbook. Li Hong looked at Professor Zhang in the stands a little helplessly.

What Li Hong said was indeed true, and Lu Tao couldn't refute it: "This is only the first class, bear with it." “

"That classmate, get up and talk about it. Perhaps it was because the two of them were disturbed by their words, or maybe Professor Zhang, who had never cared about what his classmates did in class, wanted to show his authority. In short, Professor Zhang named him for the first time.

A university teacher usually has several classes, and there are only a few classes a week, and if you are not the class teacher, you sometimes don't even know the names of the students.

With a bang, all the students in the two classes turned their heads and looked in the direction of Professor Zhang's finger.

Li Hong pointed to his nose and was a little puzzled: "Call me?"

"The one next to it. Perhaps tired of reading, Professor Zhang took off his glasses directly and walked around the podium leisurely.

Lu Tao was a little helpless, so he said a few words to Li Hong, how could he catch himself, it was really unlucky, if he couldn't answer and left a bad impression on Professor Zhang, then how would he do his work at that time? Isn't it lifting a stone to shoot himself in the foot?

Therefore, for him at present, this question must be answered well, and Professor Zhang must be given a good and deep impression.

Li Hong, who was next to "Teacher Zhang", was sitting with a stupid smile, Lu Tao stood up and looked at Professor Zhang, his face was not embarrassed at all, and he said calmly.

"Seeing that the classmate next to you just now is talking energetically, you can talk about the relationship between enthalpy and entropy. “

Lu Tao directly opened the textbook and read it up: "Entropy change refers to the change in the degree of chaos in the system, and the change of entropy to a positive value indicates that the degree of chaos in the system increases. △H is the enthalpy change, △S is the entropy change, △G is the free energy of the system, and t is the temperature. ”

"Yes. Professor Zhang nodded, seeming satisfied. Lu Tao breathed a sigh of relief, what is there to talk about, just like the teacher, read it again, I didn't expect it to be so easy.

After finishing speaking, Lu Tao secretly breathed a sigh of relief, and waited to sit down, but how did he know that Professor Zhang asked again: "Then what is the difference between the two?"

Lu Tao was stunned for a moment, because of the specific understanding of this concept, he really couldn't say it for a while, so he had to recall it well.

"Learning, you can't know half of it, you must know what it is, and why it is. If you see it, don't be like this classmate, who only knows the concept and doesn't know the specific application changes. Seeing that Lu Tao couldn't answer, Professor Zhang couldn't help but start preaching.

Lu Tao sighed in his heart, and secretly said that it was not good.

In fact, there is nothing to say about Professor Zhang's academic and scientific research ability, but the problem is that he has a belly of knowledge, but in the teaching area, it is really a little flattering, so his course is the most failed in every exam.

Li Hong quickly flipped through the textbook on the side, for fear of asking himself another question next, and after flipping through it for a while, he whispered: "He hasn't talked about the relationship between enthalpy change and entropy change at all, and he will only learn it in the next class." “

"......" Hearing Li Hong's words, Lu Tao almost fainted, this Professor Zhang actually asked directly what he hadn't said?

Before Professor Zhang could say anything, Lu Tao had already thought about it, looked ahead with his eyes, didn't look at the textbook at all, and said loudly: "Enthalpy is to describe the energy state of the system, and entropy is to describe the chaos of the particles of the system. ”

After finishing speaking, Lu Tao saw Professor Zhang's mouth slightly open, stopped pacing, and coughed: "Well, yes, classmates, the preview is very important, you see this classmate, I haven't talked about him yet, it's very good, everyone has to learn from him, otherwise it's just a matter of swallowing dates, don't ask for a solution." ”

Preview, a ghost, preview, Lu Tao rolled his eyes.

As soon as Bu sat down, Li Hong leaned his head over again: "Lu Tao, it's okay, you still have a preview for the winter vacation?"

Lu Tao was cheated by him once, and said directly: "You will suffer yourself in the next class, I have to run first, if you call the name, you have to answer." “

After taking a class, I already have a general understanding of Professor Zhang's temperament, and I have already learned it in my previous life, so I naturally don't want to suffer anymore. Lu Tao took the textbook and left, but before he reached the door, he was seen by Professor Zhang.

"Classmate, what's your name? I just said it very plainly and understandably, and I understand the essence of it, which is not bad. Professor Zhang had a smile on his face.

"Lu Tao. Lu Tao, who wanted to slip away with the textbook, was a little embarrassed.

"Oh, you're Lu Tao?" Professor Zhang looked at him, a little surprised.

From Professor Zhang's questioning tone, Lu Tao can feel that he should have heard his name elsewhere, and it is very likely that it is not a bad review.

"Teacher Zhang, you just gave a very good lecture, from shallow to deep, incisive, but the students still don't understand this part too much, just want to ask the teacher. “

Lu Tao began to compliment and pat himself on the back, and the textbook in his hand became a prop for him to ask questions.