There is an urgent need for a scientific manuscript of newspaper materials!!!

Air pollution mainly refers to the chemical pollution of the atmosphere. There are many types of chemical pollutants in the atmosphere, and there are dozens of serious harms to the human body. China's air pollution belongs to coal-type pollution, the main pollutants are soot and sulfur dioxide, in addition, there are nitrogen oxides and carbon monoxide.

These pollutants mainly enter the human body through the respiratory tract and are transported directly from the bloodstream to the whole body without the detoxification action of the liver. Therefore, chemical pollution of the atmosphere is very harmful to human health. This hazard can be divided into three types: chronic poisoning, acute poisoning, and carcinogenic effects.

Chronic poisoning The concentration of chemical pollutants in the atmosphere is generally relatively low, which mainly produces chronic toxic effects on the human body. Scientific studies have shown that chemical pollution of the urban atmosphere is an important cause of diseases such as chronic bronchitis, emphysema, and bronchial asthma. Acute poisoning When a large amount of harmful gases are emitted from the factory, and there is no wind and fog, the chemical pollutants in the atmosphere are not easy to disperse, and people will be acutely poisoned.

For example, in 1961, three petrochemical companies in Yokkaichi City, Japan, continued to emit large amounts of chemical pollutants such as sulfur dioxide, coupled with windless weather, which caused asthma among local residents. Later, this air pollution was brought under control, and the incidence of asthma was reduced.

Carcinogenic effect Among the chemical pollutants in the atmosphere, polycyclic aromatic hydrocarbons (such as 3,4-benzopyrene) and PB-containing compounds have carcinogenic effects, among which 3,4-benzopyrene has the strongest effect on lung cancer. Burning coal, driving cars and cigarette smoke all contain a lot of 3,4-benzopyrene. Chemical pollutants in the atmosphere can also fall into water and soil, as well as on crops, where they can be absorbed and enriched by crops, thereby endangering human health.

Be sure to check the template first.

Making an English tabloid is similar to making a blackboard newspaper, you must first confirm the distribution of the entire page and their size, always not able to write a piece here when you are happy, and write a piece when you are irritable, which is not only not beautiful but also can not experience the effect of English tabloids. Therefore, be sure to check the template and draw each piece carefully with a pencil so that it does not overlap each other.

Get ready to make tools for English tabloids.

If you want to sharpen your tools, you must be prepared. And the preparation of the English tabloid is to prepare the basic tools, and we can't always draw it with our eyes. So we have to be ready first:

Pencils, triangular rulers, some template icons (i.e. things that can be drawn according to his appearance), erasers, etc. Only when the tools are ready, we don't panic when we need them.

Think about what you want beforehand.

Since we are going to draw the English world we want on a piece of paper, we must first plan what we want to write and what we should write, otherwise it will make others think that the content of this English tabloid is chaotic and unqualified, so we must remember to plan the content required for each template first, and then consider writing and producing.

<> tabloid headline – the force point is prominent.

When someone reads an English tabloid, the first thing they look at is the overall layout, and then they pay attention to how well our headline is written. Therefore, when writing tabloid titles, try to highlight the points, that is, the words should be big and not small, you don't need to write regular simplified characters, you can consider writing traditional Chinese characters or hollow words, etc., the color is best to match the color of the two words, that is, one color for the title and one color for the background of the title.

Content illustrations – not fancy.

When many students make English tabloids, they especially like to use illustrations, drawing a ball here and a bamboo there. In fact, have you ever thought that although this will make the whole English tabloid look full of content, it will actually make people very tired at a glance, and you can't find the point, and you don't know whether the focus you want to express is the word or the picture, so the content illustrations should not be too fancy, and leave some blanks for other places.

Subheadings – The font size should not be too large and the color should be slightly darker than the main heading.

To make an English tabloid, you must not only have a main headline, but also a subheadline. Try to include a subtitle at each template so that you can clearly find the point of the content. However, the color of the subtitle should not be too bright, it will be more suitable to be slightly darker than the color of the main title, and the font should not be too large to avoid competing with the main title.

Knowledge of science and technology.

In society, it is customary to associate science and technology together, collectively referred to as "science and technology". In fact, the two are closely related, but also have important differences. Solve theoretical problems scientifically, and solve practical problems with technology.

The problem to be solved by science is to discover the relationship between conclusive facts and phenomena in nature, and to establish theories to connect facts and phenomena. The task of technology is to apply the results of science to practical problems.

Science is primarily dealing with uncharted territory, and its progress, especially major breakthroughs, is difficult to predict; Technology is working in a relatively mature field and can make more accurate planning.

The essence of science and technology: the discovery or invention of the connection between things, through which various objects form a specific system to achieve a specific function.

1.Tradition holds that science is a system of knowledge about nature, society, and thinking that has been accumulated by human beings.

2.By "science" we mean the natural sciences that study natural phenomena and their laws; Technology generally refers to various tools, equipment, technologies and process systems that are synergistically composed of practical experience based on the principles of natural sciences and for a certain practical purpose, but does not include the technical content corresponding to social sciences.

3.Science and technology are a dialectical unity, technology proposes topics, science completes topics, science is discovery, and is the theoretical guidance of technology; Technology is an invention and a practical application of science.

<> introduction of technology products.

1. Shenzhou-7 manned spacecraft.

The Shenzhou-7 manned spacecraft, one of China's Shenzhou spacecraft series, was launched with the Changhui Hail-2F rocket. It is China's third manned spacecraft. Breakthrough and mastery of the relevant technology of out-of-cabin knowledge activities.

The Shenzhou-7 spacecraft is all meters long and consists of an orbital module, a return module and a propulsion module. The Shen-7 manned spacecraft weighs 12 tons.

The Long March 2F launch vehicle and escape tower combination are as tall as a meter. The spacecraft was launched from 21:07 to 22:27 on September 25, 2008, and successfully landed at 17:37 on September 28, 2008 at the main landing site of Siziwangqi in Inner Mongolia, China, with a total flight of 2 days, 20 hours and 27 minutes.

2. Artificial rainfall technology.

The principle of artificial rainfall is to sprinkle some material in the air, and it is a condensation nucleus of water vapor in the clouds, which makes the water droplets continue to grow, and finally the effect of rain is realized. Artificial rainfall is a rain-inducing process. There are cold and warm clouds in the sky, but they lack the condensation nuclei formed by water vapor and do not form rain.

However, if dry ice, silver iodide, etc. are sprinkled in cold clouds, and calcium oxide is sprinkled in warm clouds, the cloud droplets will increase and become raindrops.

3. Communication satellite system.

The communication satellite is an artificial earth satellite used as a radio communication relay station in space, and it is the space part of the satellite communication system, which is used to realize the communication between earth stations or between spacecraft and earth stations with radio communication signals. Compared with the general county-to-county mode, satellite communication has an important means of long communication distance, large transmission capacity, wide coverage area, not limited by geographical obstacles, excellent communication and high economic benefits.