Compared with the previous two days, the most significant change in Chang Kai's [Profile] is that there are two more skills.

These two skills, one is obtained by Tong Guò with [Redeem Huàn Points], and the other is obtained by Tong Guò with [Savage Extraction], and it is precisely because of learning these two skills that the system's [experience] has increased by 30 points correspondingly.

Among them, 20 points are added to learning [Intermediate English Skills], and 10 points are obtained for [Elementary Piano Skills].

It was this sudden gain that allowed the system to increase [experience] from 106 to 184 in just two days.

The main quest of "upgrading the system to level 3 within ten days" released by the system is not stressful at all.

Taking advantage of this time, Chang Kai checked the [Redeem Huàn System] again, and then was pleasantly surprised to find that the [Redeem Huàn Points] had changed from 183 last night to 197.

In other words, if you add 3 more [Redeem Huàn Points], you can redeem Huàn for a new intermediate skill!

These new huàn points will not be because he sent Jiang Jinghao to the infirmary "regardless of his previous suspicions", and then he was respected by the melon-eating masses who did not know the truth?

It's good, it's halal.

After doing the recess exercises, Chang Kai went to the bathroom and gained 1 point of strength after consuming 8 units of power.

As the preparatory bell rang for the third class, physics teacher Zhou Zhengguang walked into the classroom leisurely.

Zhou Zhengguang was wearing thick black-framed glasses, his long hair on both sides looked a little greasy, and the clothes on his body were meticulous.

He is almost thirty-five years old, about 1.7 meters tall, and likes to play basketball like Chang Kai.

He is also the only one among the several teachers in the senior class who has not taught Chang Kai, but the latter is still very familiar with him.

One is because Chang Kai and this teacher Zhou once played in a team, and the other is because the teachers of a high school sit in class.

In the evening self-study time, the teachers of the first high school have to be on duty, of course, they don't have to be on duty every day like the students, but there are at least two days a week, so they are also quite hard.

The teacher's duty room is located in the middle of each floor of the school building, with six sets of desks and chairs, and usually three to six teachers are on duty during the evening self-study time from Monday to Thursday.

On duty, they either correct homework or take questions from students.

Teachers in the first year of high school will be relatively relaxed, and teachers in the third year of high school will be busier, and some teachers will not even be able to get off class until ten o'clock, which is of course relative.

Because of each of them, they serve all students.

The floors of each grade are actually fixed, and the same floor is basically the same grade.

But there will always be some strange things that like to go to the building, such as the first year of high school students will run to the floor of the third year of high school to ask questions, or the third year of high school students will run to ask the teacher of the first year of high school.

This is nothing for a teacher in the third year of high school, but it is a little embarrassing for some teachers in the first year of high school.

After all, not every teacher who teaches the first year of high school can solve the problems on the mock paper of the college entrance examination.

There are not too many students in the building, because in addition to the class schedule, there is also a teacher's class schedule in the first high school.

If you really want to ask questions, you will list them in advance and ask them according to the teacher's schedule.

It can also be seen from this that the students of the first high school are still very free when they study at night, and the students who have the intention to go out to breathe can go out of the classroom in the name of "asking questions to the teacher".

Of course, if someone goes out for no reason and is caught, he loses the right to ask questions to the teacher in the classroom this semester.

Chang Kai likes to hear about the class system of teachers in a high school, because he is not used to asking questions to students who study well.

One is that I am worried about affecting this student who is good at studying, and I am also worried about affecting the classmates around me, and the other reason is that I feel that asking questions to classmates has a kind of illusion of inferiority.

Chang Kai's self-esteem is actually quite perverted.

But what he is willing to ask questions is physics and chemistry, so Zhou Zhengguang, a teacher who has played with him and often answers difficult questions for him, is naturally no stranger to him.

I wonder if this Teacher Zhou will remember himself?

After all, his physics score can also be mixed with an upper middle level, and he should not enter the list of outstanding students in the teaching and research group.

In Chang Kai's eyes, the teacher of mathematics, physics and chemistry should be like Mr. Zhou, "male", "in the prime of his thirties", "black-framed thick-soled glasses that symbolize erudition"

In fact, Mr. Zhou's ability is still commendable.

Isn't it enough that he enters the classroom early every time he goes to class and habitually drags the class after class every time?

Mr. Zhou's plan is actually similar to that of Mr. Li, Mr. Chen and others, and he also plans to use the first two months to systematically string through several textbooks, and then start the "sea of questions tactics" after the mid-term exams of this semester

After Mr. Zhou introduced himself, he began to talk about the most basic part of high school physics - "mechanics".

"Yaga!" When Jiang Jinghao, who was trotting back to the classroom, found that he was late, he immediately stopped at the door of the classroom, raised his hand to salute Teacher Zhou, and reported solemnly.

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With Jiang Jinghao's slip of the tongue, the students who listened carefully were suddenly stunned, and then began to burst into laughter, and the classroom was also a mess.

Zhou Nan almost squirted out a mouthful of salt soda, and couldn't help but turn around and smile at Chang Kai, who shook his head in response.

Teacher Zhou couldn't help it, nodded and let Jiang Jinghao, who was eager to find a crack in the ground, enter the classroom, and continued, "We just analyzed the magnitude of static friction, and the next thing we want to talk about is sliding friction." Sliding friction is proportional to pressure, i.e. to the perpendicular force of one object to the surface of another. ”

As he spoke, he wrote a formula "F=μFN" on the blackboard, and explained, "F in the formula represents the magnitude of sliding friction, FN represents the magnitude of positive pressure, and μ is called the kinetic friction factor." FN represents the pressure between the surfaces of two objects, which is elastic force in nature, not gravity, and more cases need to be determined in combination with motion and equilibrium conditions; μ It is related to the material of the contact surface, the condition of the contact surface, and there is no unit"

With Mr. Zhou's explanation, Chang Kai was also taking notes carefully, and he found that his comprehension seemed to be much stronger than before.

Is it because of the increase in intelligence?

Chang Kai couldn't figure out the answer, but what he could be sure of was that Teacher Zhou should be teaching a class to senior students for the first time.

Because the progress of today's class is so slow, the two classes have just finished talking about friction.

Friction is only a very small part of mechanics, how long does it take to finish and understand mechanics?

There are also optics, electromagnetism, thermal, and wave science in the back