What are the cognitive goals in the language domain of young children?

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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.

The objectives and content of the language domain for Kindergarten children are as follows:

a) Objectives. 1.Willing to talk to people and speak politely;

2.Listen carefully to each other's speech and understand everyday language;

3.Be able to say what you want to say clearly;

4.likes to listen to stories and read books;

5.Able to understand and speak Mandarin.

(2) Content and requirements.

1.Create a free and relaxed language communication environment that supports, encourages, and attracts children to talk to teachers, peers, or others, experience the joy of language communication, and learn to use appropriate and polite language communication.

2.Develop the habit of listening and developing language comprehension skills.

3.Encourage children to express their thoughts and feelings boldly and clearly, try to explain and describe simple things or processes, and develop language expression and thinking skills.

4.Guide children to get in touch with excellent children's literature, make them feel the richness and beauty of language, and help children deepen their experience and understanding of the works through a variety of activities.

5.Cultivate children's interest in simple marks and text symbols that are common in daily life.

6.Use books, drawings and other ways to arouse children's interest in books, reading and writing, and develop pre-reading and pre-writing skills.

7.Provide a Putonghua language environment to help children become familiar with, understand and learn to speak Putonghua. Ethnic minority areas should also help young children learn their own languages.

Summary. It is determined according to the overall requirements of pre-school child care and education, and it is an important component of the overall goals of pre-school education.

The goals of language education for children are based on the overall goal of preschool education and are an important part of the overall goal. They are essentially the same, and they all lay the foundation for a child's lifelong development. The goal of language education for young children in China is formulated by taking into account the needs of society and the law of children's language development.

The so-called age goals refer to the different educational goals of young children at different ages. It is a characteristic of the age stage goal to decompose the language education goals into different requirements and form specific goals for children at each age stage to gradually increase the requirements.

This paper discusses the relationship between the overall goal, age goal and activity goal of early childhood language education.

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It is determined according to the overall requirements of pre-school child care and education, and it is an important component of the overall goals of pre-school education. The goals of language education for children are based on the overall goal of preschool education and are an important part of the overall goal. They are essentially the same, and they all lay the foundation for a child's lifelong development.

The goal of language education for young children in China is formulated by taking into account the needs of society and the law of children's language development. The so-called goals of the age stage refer to the different educational goals of children at different ages. It is a characteristic of the goals of the age stage to disperse the goals of language education into different requirements and form specific goals for children of each age to gradually increase their requirements.

The details are as follows:1. Listen carefully and be able to understand common language.

2. Willing to speak and be able to express clearly.

3. Have civilized language habits.

4. I like to listen to stories and read books.

5. Have preliminary reading comprehension skills.

6. Have the desire and preliminary skills of written expression.

Language Objectives for Small Classes:

1. Guide children to pay attention to listening to others, understand the basic content of the conversation, and initially develop good listening habits.

2. Guide children to speak Mandarin and be able to communicate in Mandarin.

3. Encourage children to express their requests and wishes boldly.

4. Be able to recite 5-6 children's songs in a simple class and retell a short story or prose.