Write a paragraph with anxiety 200?

1. I am not serious about my homework, and when I see the teacher, I feel uneasy, for fear that the teacher will leave me to be punished.

2. My heart is uneasy, uncertain, anxious, and frightened, like a deer jumping in my heart.

3. My heart is like fifteen buckets of water - restless, unable to be quiet for a long time.

4. Looking at the broken bottles of bile tablets all over the ground, I opened my mouth nervously and stood there in a daze, feeling uneasy, if my father came back and found out, he would definitely criticize me fiercely.

5. When I am doing something that my parents don't like, I will have a feeling of being a thief, and I will feel very uneasy.

6. With a restless heart, they are extremely cautious in their words and deeds, and naturally their voices are not raised up, even their eyes and heads are much lower than before.

7. The day of the final exam is approaching day by day, and I am also waiting in this anxious anxiety.

8. When my classmates and I were facing math problems, I felt that my answers were different from those of the top students in the class, and I felt uneasy and a little depressed.

9. Xiao Ming copied other people's answers in the examination room, and he was nervous, for fear that others would find out.

10. I came home late today and waited for me at home nervously, and I will go home a little earlier in the future to reassure my mother.

11. He walked into the examination room nervously, silently praying in his heart that he could pass the exam smoothly.

12. I forgot to bring my language papers today, and I was nervously lying on the table waiting for the teacher to come.

There are many words to describe anxiety, restlessness, restlessness, fear, and so on. Words that describe indecision include indecision, indecision, dilemma, muddling, half-heartedness, and so on.

Mental activity description of anxiety "Please read the content on the blackboard for a minute and write it silently! "Ahh We're going to write silently just after the lesson, it's too sudden!

I haven't remembered it yet! Besides, it's only been a minute, have you reviewed so much? Alas, let's take a look!

I looked at the dense words on the blackboard and looked at them one by one.

Teacher Zuo Tian left the memorized texts did not memorize, today with a nervous mood to come to the school, praying in my heart that the teacher will not be called by the teacher during class, or the teacher will not be allowed to go home after school, and the school will not let me go home until I memorize it.

Discharge cooling is another type of convection cooling. Unlike regenerative cooling, the coolant used for exhaust cooling absorbs heat to the thrust chamber and is discharged out of the combustion chamber instead of entering the combustion chamber to participate in combustion. Direct drain coolant reduces the thrust chamber specific impulse, so the coolant flow for drain cooling needs to be minimized while only using drain cooling at the outlet section of the nozzle that is relatively less heated.

There is also radiative cooling, in which the heat flow is transferred from the combustion products to the thrust chamber, and then the heat is radiated by the thrust chamber wall to the surrounding space. Radiative cooling is characterized by simplicity and small structural mass. It is mainly used in the extension section of large nozzles and the thrust chamber of small thrust engines using high-temperature resistant materials.

When cooling in the thrust chamber of the tissue, a relatively low temperature liquid or gas protective layer is established on the surface of the thrust chamber wall to reduce the heat flow to the thrust chamber wall, reduce the wall temperature, and achieve cooling. Internal cooling is mainly divided into three methods: internal cooling (shield cooling), membrane cooling and diaphoretic cooling of head tissues. After the internal cooling measures are adopted in the thrust chamber, the mixing ratio near the wall of the combustion chamber is different from the optimal mixing ratio in the central area (in most cases, the near-wall layer rich in fuel is used) due to the need to reduce the temperature of the protective layer, resulting in the uneven distribution of the mixing ratio along the cross-section of the combustion chamber, so that the combustion efficiency is reduced to a certain extent.

Membrane cooling is similar to shield cooling in that it cools the thrust chamber wall by establishing a uniform and stable coolant film or air film protective layer near the inner wall surface, except that the coolant used to establish the protective layer is not injected by the injector, but is supplied through a special cooling belt. The cooling band is generally arranged in a cross-section of the combustion chamber or the convergence section of the nozzle. There can be several cooling bands along the length of the combustion chamber.

In order to improve the stability of the membrane, the coolant often flows through the gaps or small holes in the cooling belts, and when sweating is used, the thrust chamber wall or part of the inner wall is made of porous material with a pore diameter of tens of microns. Porous materials are usually sintered with metal powders or pressed with metal mesh. In this case, the number of pores per unit area is increased by making the micropores in the material as evenly distributed as possible.

The liquid coolant penetrates into the inner wall, creating a protective film that reduces the density of the heat transferred to the wall. When the flow rate of liquid coolant used for sweat cooling is above a certain threshold, a liquid film is formed near the wall of the thrust chamber. When the coolant flow rate is below the critical flow, the inner wall temperature will be higher than the coolant boiling point at the current pressure, and some or all of the coolant will evaporate, forming an air film.

In addition to the above thermal protection, there are other thermal protection methods such as: ablation cooling, thermal insulation cooling, hot melt cooling and composite protection of chamber walls. 3. Thermal protection scheme of high enthalpy gas generator Based on the above methods and the actual situation, the thermal protection method of high enthalpy gas generator is obtained.

The combustion chamber of a high-enthalpy gas generator differs from that of a liquid rocket engine, eliminating the front thrust chamber part, making its structure simpler and more effective. Then, the thermal protection involved is the thermal protection part of the combustion chamber wall. As the fuel enters the combustion chamber, it quickly decomposes and releases large quantities.

To describe the anxiety in a paragraph, you can write based on your own personal experience, or what you have seen and heard when you were young, such as:

I remember that it was in the fifth grade, our class math test, the test happened to be the unit I was most unfamiliar with, I tried my best, there were still several questions not answered, just as I was thinking, suddenly the class bell rang, I had to hand in the paper, the class bell seemed to be laughing at me: "Haha! Look!

Look! He still has some questions that he hasn't written, haha......”

A few days later, the results came out, and sure enough, I didn't do well in the test, and I got 89 points. If my mom had known my results, I'd be finished! Usually, I vouch to my mother that I have studied very well.

Watching my classmates playing happily, I sat on a stool, listless, motionless, thinking about how to get home.

On the way home, the bird was "chirping" in the tree, as if it was laughing at me, I lowered my head, imagining that after going home, my mother's reaction after knowing the results, at this moment, ** rang, I saw that it was my mother, adjusted my tone, and picked up ** nervously, "How did you do in this math test?" How many points were scored? ”

Mom asked, and I said, "Me, I got 93." "Okay, then let me see when you get home. ”

Hearing this, my heart was so weak that I kept worrying, I wandered downstairs for a long time, and finally decided to face this reality that I couldn't hide, I mustered up the courage and opened the door. As soon as my mother saw me, she said, "I'll see if you're doing it wrong." ”

I pretended to go to the toilet and hurriedly ran into the toilet, my mother seemed to know my little secret, I couldn't hide it from my mother, so I told my mother about the cause and effect of this incident, and I was instantly relieved, but I was still waiting for my mother's criticism.

However, instead of criticizing me, my mother praised me, saying, "First of all, dare to admit your mistakes, be an honest child, and your mother will give you a thumbs up; Secondly, the number of scores is not the most important, the test is only to test your learning results during this period of time, as long as you understand the wrong questions. Hearing this, my mood instantly relaxed.

In the days to come, I will have a correct attitude towards learning, attend every class in a down-to-earth manner, and accept my grades calmly. It feels really bad to lie, like being a thief who is afraid of being discovered, and is always on the lookout. I made up my mind that I would be an honest person in the future.

Xiaofang did not perform well in the math test this time, and only scored 65 points. The teacher asks the parents to sign the homework after they go home, and the parents have to sign it after they are done. Xiao Fang was nervous, she didn't know how to explain it to her parents.

In the days of waiting, although he was calm on the surface, he tossed and turned every night, couldn't sleep at night, and was always inexplicably distracted during the day.

The neighbor came to ** and told her that your mother was sick and had been admitted to the fourth hospital. She didn't ask much and put down the **, she was uncertain and hurried to the fourth courtyard.

He didn't dare to take the schoolbag, for fear that the books in the schoolbag would suddenly jump out. , grabbed him by the collar and asked him loudly, why don't you take me out and copy a paragraph? And he walked out in a trance, as if he heard the teacher shouting at him behind his back, you didn't finish the test paper?

Why did you pay it? He leaned against the wall by the door, gasping for breath and didn't seem to hear the teacher say this, but he felt a chill behind him, was it the wall was cold, or was it sweating?

The cat jumps up and down in a hurry、Is there going to be a big incident.! (

He would stand up and do it again, as if something had happened.

Summary. I was already out of breath with nervousness, and I thought, "What if I pull the wrong one?"

I thought I forgot the next sentence, how to pull, what should I do? Not ......I don't want to be on stage to perform ......Oh......I had to go on stage ...... performWhat to do? What to do?

Cold sweat broke out in my palms.

Write about the nervous mental activity, write a paragraph?

Not ......I don't want to be on stage to perform ......Bring a group, oh ......I had to go on stage ...... performWhat to do with where to burn? What to do with the Piyin code? Cold sweat broke out in my palms.

The teacher began to announce the results of this exam, and several people had passed, and my name had not yet been pronounced, and my heart had been pounding and pounding, my palms were sweating, and my heart was chaotic. Did the old trembling master shoot my book in the wrong place? Did you miss my papers?

My seat seemed to be covered with nails, and I couldn't sit in the hole, and I really wanted to rush up to ......

Teacher Hongzi began to announce the results of this exam, and several people had already passed by, and before my name was pronounced, my heart was pounding, my palms were sweating, and my heart was messy. Did the teacher take my notebook in the wrong place? Did you miss my papers?

My seat seemed to be overgrown with trembling nails, and I couldn't sit still, and I really wanted to rush up and ...... immediately