What Happened If You Didn't Take The College Entrance Examination? I Recommend

Now Lu Shixian is in class, neither handing in homework nor attending classes.

He was like a mascot when he got the Yanda recommendation agreement.

Especially at the back door, from time to time there will be groups of other high school students or even high school students who come to observe.

At the same time, sometimes the teacher really likes to enliven the atmosphere with him.

At the stage of the second year of high school, subjects have been divided, and all the key learning content is the content to be tested.

So the following students listened very carefully.

"Students, today we start to study the rest of the key content of Chapter 3 Magnetic Field."

"Before we have systematically studied the magnetic field and magnetic field, magnetic induction intensity, several common magnetic fields, and the force of the magnetic field on the current-carrying wire."

"Next, let's study the motion of charged particles in a uniform magnetic field. Please turn to page 54." The lecturer was Gao Yuan, the former physics teacher in the first year of high school.

She is a very humorous female teacher, what impressed Lu Shixian the most was her self-introduction in the first class.

"Because my parents gave me one less word, so that I can never bombard the fluorescent screen with the analog video signal in the TV, so as to appear in front of everyone."

"But I can project my appearance onto your retinas through the refraction of light through the cornea, lens and other refractive media."

At this time, Gao Yuan picked up the chalk and wrote four large characters on the blackboard.

"Hall Effect."

Then he asked: "This question is relatively simple, I have already mentioned it in the last class."

"Is there any classmate who can help to explain its definition?"

As soon as she finished speaking, many hands were raised immediately.

But Gao Yuan searched for a long time and finally chose the most surprising candidate.

"Student Lu Shixian, since you are listening in the classroom, can I ask you to help me answer this question?"

"You are the champion of the biology competition, and biology and physics are very closely related, so this question must not be difficult for you, right?"

Lu Shixian, who was fishing underneath, was suddenly called and stood up in a daze.

Hearing the reminding sound of the students next to him reading the answer in a low voice, Lu Shixian seemed to see a savior.

"Forehead"

"Oh, the metal conductor plate is placed in a uniform magnetic field perpendicular to it. When the conductor plate passes a current, a potential difference will be generated between the two sides parallel to the magnetic field and the current."

"It's the Hall effect."

Gao Yuan nodded after listening, but did not express any opinion.

Then he smiled and said to him: "Sit down!"

"Student Lu Shixian, if you can treat physics like a living thing, I think this type of big question will definitely not be difficult for you."

"Although you have been recommended to Yenching University, physics is also very vast, and it will not affect your appreciation of the beauty of physics."

Suddenly, there was a burst of laughter from the audience.

He sat down, touched the tip of his nose silently, and immediately felt that he was being connoted.

Isn't it impossible to make a U-shaped metal frame pass through a uniform magnetic field?

Isn't it just a few acceptance speeches?

Don't you just have no interest in physics?

As for dragging out such a whipping corpse?

Of course, Lu Shixian also knew that everyone was joking, so he just laughed it off and didn't care.

Because in biology class, with Wen Shaoying's approval from time to time, he found his place again.

Going to class was just an interlude. After a few days of thinking, Lu Shixian finally sorted out the ideas for the thesis.

Start formally writing your dissertation.

He had already thought about the topic, which is called "Discussion on the "Co-cultivation of Rice and Shrimp" Model, Analysis of Procambarus clarkii on the Content of Reducing Substances and Economic Benefits of Paddy Field Soil"

Sitting in front of the computer, Lu Shixian becomes an emotionless coder.

Abstract: Putting different numbers of Procambarus clarkii in paddy fields with similar conditions, and then changing the flooding time of the soil in front of the paddy fields, discussing the reductive state of the paddy plow layer soil under the rice-shrimp co-cultivation mode, and using the input-output method to study its economic Benefits

The results showed that in the rice-shrimp co-cultivation model, increasing the number of Procambarus clarkii, the total amount of soil reducing substances in the paddy field plow layer will change significantly, but the soil active reducing substances

With the increase of the number of crayfish, the output value of rice gradually decreased, the cost of co-culture of rice and shrimp increased, the output value of crayfish increased significantly, and the comprehensive output value of the co-cultivation model of rice and shrimp increased, but the room for the increase of the comprehensive output value of rice and shrimp gradually decreased with the increase of the number.

Key words: co-culture of rice and shrimp; reducing substances; economic benefits;

abstract: different antities of crayfish were put to rice fields with procabar crkii

key words:

The rice-shrimp co-cultivation model is a new type of biological symbiosis model that realizes the mutually beneficial symbiosis of rice and Procambarus clarkii after the rice-shrimp rotation and improves farmers' income. This model can greatly improve the utilization rate of resources and the income of farmers

The burrowing habit of shrimp can plow the soil, increase the oxygen content of the soil, and help the growth of soil aerobic microorganisms, animal activities and rice roots. 【1】

Shrimp excretion and shelling can increase soil organic matter content, improve soil fertility, and increase soil carbon pool reserves. 【2】

Therefore, co-culture of rice and shrimp can reduce the use of pesticides and fertilizers, reduce the residue of chemical substances in soil and water, and make the product more green and pollution-free [3].

At the same time, the chitosan rich in shrimp shells is conducive to increasing the content of soil water-stable aggregates and improving soil structure and stability [4].

(5000 words omitted in the middle)

At present, the rice-shrimp rotation mode has been applied on a large scale in China. Although it has improved the income of rice fields, there is a time conflict between shrimp farming and rice planting, which has little effect on improving economic income.

In response to this situation, this paper innovatively launched the co-cultivation model of rice and shrimp

Written here, the review is over.

Lu Shixian started to write the first part of Materials and methods.

The first is the source of the samples and the general situation of the test site.

The test was carried out in Xingfu Village, Xingfu Town, Jinling District, Jinling City, Jiangsu Province, located at East Longitude

Then there is the experimental design

e, directly copy the previously designed experiments.

The next step is data processing and analysis, which is to put the previous work in the laboratory on it.

Then the second part analyzes the results.

It is mainly to analyze the content of soil reducing substances and the difference in yield and output value of rice and shrimp co-cultivation model.

The last thing is to discuss.