2 short eyes and beating drive to reveal the short buds on sunny days.
He won the first place in the exam this time, which we all say is a coincidence. He treats people warmly.
I am puzzled: "How can his" cow "be so accurate?" Curiosity qū shǐ I went to his house, which may solve the mystery. When I got to his house, he invited me in enthusiastically. I saw books on the bed, on the table and in the cupboard, including Inside and Outside the Classroom, Childhood, 100,000 Why, etc.
The real name of the "bragging" king is Chen Jin, but this real name is almost forgotten by everyone. Because he likes to brag, and he plays it very well. Don't talk about us classmates, sometimes even the teacher listens to him blowing wonderfully! This famous "braggart" king is only thirteen years old, short and short, and his face is black and thin. But those eyes are big and divine.
On the first day of his transfer from the countryside to the city, he boasted in his class. He said that he knew your height and weight when he knew how long your feet were. I thought of his ugliness, so I measured my feet with a ruler and reported the figures. He told me my height and weight after a while. The classmates all said that he was "bragging". I went home at night and measured my height and weight, and the error with him was very small. But I'm still bá n xì n bá n yì. Is this a coincidence? Once again, the evening self-study is over, and everyone watches the stars according to the homework assigned by the science teacher. The "bragging" king began to brag again. He said, "I know that the moon is white and Mars is orange." After listening to his words, I thought, "I didn't see your ugliness last time, and now you are bragging. I have to satirize you." But then I thought, "No, what if what he said is right again? I have to ask the teacher first! " I didn't know what he said was true until I asked the teacher. His eyes are amazing! A new building was built next to the school, and the "bragging" king took the opportunity to "brag": "Who knows the distance from the school gate to the building?" Students, you look at me, I look at you, and there are many discussions. Some say they don't know, some say they use a tape measure, and some say they use advanced surveying and mapping instruments to measure. He said proudly, "I just need to visually check!" At this point, everyone focused on the "bragging" king, only to see his arm stretched out, his thumb straightened, he squinted, thought for a moment, and said loudly, "10: 35 meters!" Ah! It's all j and jīng què to two decimal places. After that, I quietly measured it with a tape measure, and only one meter was missing. Oh, what a mystery!
I can't figure out how his cow can blow so accurately. qū shǐ I went to his house, which may solve the mystery. When I got to his house, he invited me into the house enthusiastically. I saw books on the bed, on the table and in the cupboard. There were 100,000 children in and out of class. Why not wait? That's not a book, it's his "cow". If there are no these "cows", can he blow? I punched him hard on the back and said, "You guy, I finally got this cow." Say that finish, we laughed together.
The second paragraph is auspicious writing.
6 the first time: measure your feet to know your height
Know the colors of the moon and Mars for the second time.
The third distance measurement with glasses
It means that he is not bragging, but reading a lot and knowing a lot.
8 braggart
Respondent: juanbo0420-assistant level 2 4-3 12: 12.
1 dubious precision drive
Small-eyed challenge ring drives efforts to reveal the length of sunny days.
It is a coincidence that Xiaohong and I bought the same hair accessories.
I warmly embraced my long-lost classmate.
4: "How can his" cow "be so accurate?" Curiosity qū shǐ I went to his house, which may solve the mystery. When I got to his house, he invited me in enthusiastically. I saw books on the bed, on the table and in the cupboard, including Inside and Outside the Classroom, Childhood, 100,000 Why, etc.
5 A, bragging is very bragging. "The real name of the king is Chen Jin, but this real name is almost forgotten by everyone. Because he likes to brag, and he plays it very well. Don't talk about us classmates, sometimes even the teacher listens to him blowing wonderfully! This famous "braggart" king is only thirteen years old, short and short, and his face is black and thin. But those eyes are big and divine.
B, bragging three times He bragged in class on the first day when he transferred from the countryside to the city. He said that he knew how long your feet were, and he knew your height and weight. I thought of his ugliness, so I measured my feet with a ruler and reported the figures. He told me my height and weight after a while. The classmates all said that he was "bragging". I went home at night and measured my height and weight, and the error with him was very small. But I'm still bá n xì n bá n yì. Is this a coincidence? Once again, the evening self-study is over, and everyone watches the stars according to the homework assigned by the science teacher. The "bragging" king began to brag again. He said, "I know that the moon is white and Mars is orange." After listening to his words, I thought, "I didn't see your ugliness last time, and now you are bragging. I have to satirize you." But then I thought, "No, what if what he said is right again? I have to ask the teacher first! " I didn't know what he said was true until I asked the teacher. His eyes are amazing! A new building was built next to the school, and the "bragging" king took the opportunity to "brag": "Who knows the distance from the school gate to the building?" Students, you look at me, I look at you, and there are many discussions. Some say they don't know, some say they use a tape measure, and some say they use advanced surveying and mapping instruments to measure. He said proudly, "I just need to visually check!" At this point, everyone focused on the "bragging" king, only to see his arm stretched out, his thumb straightened, he squinted, thought for a moment, and said loudly, "10: 35 meters!" Ah! It's all j and jīng què to two decimal places. After that, I quietly measured it with a tape measure, and only one meter was missing. Oh, what a mystery!
C, solve the mystery I can't figure out how his cow blows so accurately. qū shǐ I went to his house, which may solve the mystery. When I got to his house, he invited me in enthusiastically. I saw that there were 100,000 books on the bed, on the table and in the cupboard. Why don't you wait? It's not a book, it's his "cow". Without these "cows", can he blow? I punched him hard on the back and said, "You guy, I finally got this cow." Say that finish, we laughed together.
The first time: the braggart tells you how long your feet are, and you know your height and weight.
The second time: the braggart said that he knew that the moon was white and Mars was orange.
The third time: the braggart said that the distance between the school gate and the building could be obtained by visual inspection.
He can brag because he has a wide range of knowledge.
8 "bragging" king
I have done this reading problem!
Responder: Ye De-Trainee Magician Level 2 4-5 23:32
I. Books, 100,000 Why
"100,000 why? From the day it was published, it has influenced China people from generation to generation, guiding us to think and explore nature. For example, mpemba effect in the book: Why does boiling water freeze before cold water? Help us to correctly understand the freezing phenomenon of water.
Mpemba effect, known as the world's physics problem, has been denied by physics teachers for more than 40 years, and even described as a lie by the media. However, according to the theory of middle school physics, we can find that the Mpamba problem is just a comprehensive problem of middle school students' knowledge, and every middle school student can master the method of proof.
Proof: Assuming that hot water can freeze before cold water, the necessary conditions are either that the freezing point of hot water is higher than that of cold water, or that the cooling speed of hot water is faster than that of cold water. Because the freezing point of pure hot water is the same as that of cold water under normal pressure, it is necessary to prove that the cooling rate of hot water is faster than that of cold water in order to prove mpemba effect.
According to the basic theory of physics, the evaporation intensity of hot water is greater than that of cold water and the density is less than that of cold water. If you take two identical unsealed containers and put in the same amount of water, one is hot water and the other is cold water, put them in the same external ambient temperature at the same time. In the process of cooling, hot water loses more water due to evaporation than cold water, so the final quality of water with high initial temperature must be less than that with low initial temperature, and the cooling speed of hot water must always be faster than that of cold water.
If you take two identical sealed containers and put in the same amount of water, one is hot water and the other is cold water, put them in the same external ambient temperature at the same time. In the process of cooling, the air pressure in the container formed by the increase of density and the decrease of volume of hot water is necessarily lower than that of cold water. The boiling point temperature of hot water is lower than that of cold water and the convection intensity is greater than that of cold water. Hot water always loses more heat than cold water in unit time, so the cooling speed of hot water is always faster than cold water.
Because the cooling rate of hot water is always faster than that of cold water under the condition of the same quality and the same external environment temperature, the temperature of hot water will be lower than that of cold water when the external environment temperature is in a state of continuous cooling; When the external environment temperature is in a cooling state within a specific time or temperature range, the temperature of hot water will be equal to or higher than that of cold water. Therefore, it is a common phenomenon that the temperature of hot water will be lower than that of cold water under the condition of homogeneous quantity and external environmental temperature. It is a specific phenomenon that cold water freezes before hot water under the condition of specific external environmental temperature. mpemba effect conforms to the basic theory of physics.
Attachment: the key points of operation to complete the experiment of freezing boiling water first.
For more than forty years, few people in the world have completed the experiment of boiling water freezing first, because the experimental method is unscientific. Theoretically speaking, water at 36℃ can freeze before water at 35℃ under the condition of homogeneous quantity and external environmental temperature, but if their temperatures are close, there is little difference in evaporation intensity and density, so it is difficult to show the advantages of hot water in cooling speed by experimental methods. According to the basic theory of physics, 100℃ is the boiling point of water at normal pressure, and the density of water is the highest at 4℃. In order to complete the experiment of hot water first icing more clearly, we can give the known conditions according to the Mpamba problem, choose hot water and cold water as close as possible to 100℃, reasonable initial temperature of external environment experiment, and slow down the decline rate of external environment temperature; Unsealed containers have a large evaporation area, and sealed containers have a high degree of sealing. Special attention should be paid to the extraction method of boiling water: once boiling water leaves the heating source, the temperature and evaporation intensity drop rapidly, so it is necessary to extract quantitative boiling water quickly and accurately, and then extract cold water according to the requirements of homogeneity and quantity.
Operation method of using unsealed container to complete the experiment of boiling water freezing first: (for reference)
1, control the initial temperature of the experiment in the freezer at 4 degrees Celsius, take two identical plates, put the same amount of water, one is cold water at 4 degrees Celsius, and the other is hot water near 100 degrees Celsius, and put them in the freezer at the same time. The temperature in the freezer is controlled to drop by 1 degree Celsius every hour (or by 1 degree Celsius every two hours), and the final quality of hot water and cold water is recorded after freezing.
2. In winter, the experiment is completed by natural cooling. When the outdoor temperature is not lower than 4 degrees Celsius at noon and the lowest temperature at night is-2~3 degrees Celsius, you can choose to take two identical plates at noon and put in the same amount of water, one is hot water close to 100 degrees Celsius, and the other is cold water with the same outdoor temperature. Put them in the same outdoor position at the same time and record the time when the hot water and cold water are completely frozen and their final mass.
3. According to the experimental methods of three senior high school students in Shanghai, the final quality of hot water and cold water was recorded after freezing. According to the fact that the final mass of hot water is less than that of cold water, it is proved that hot water can freeze before cold water because its cooling speed is always faster than that of cold water.
When the sealed container is used for the experiment, please refer to methods 1 and 2 of the unsealed container experiment.
Respondent: Hope for self-confidence-Trainee Magician Level 2 4-6 1 1:59 classification rose to the list of talents.
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