Chalk teaching aids are an indispensable tool for teaching. It is one of the most primitive and traditional teaching methods. It has been used for thousands of years since its application. With indelible contributions, with the advancement of history and the development of society, human understanding of chalk teaching aids has been continuously improved, that is, chalk has made great progress and made great contributions to human education, as well as classrooms for educational undertakings and Students bring great harm.
Here are a few sets of data that I hope will draw attention:
First, through the system dynamic model to study the distribution and harm of classroom dust, it is found that in the 3m diameter space of the podium, the working environment competes with the severity of the chalk damage caused by the workers in front of the steelmaking furnace.
Second, according to incomplete statistics, the average annual inhalation of chalk by a full-time teacher in China is as high as 250-260 grams, so more than 20% of the people with lung disease and cancer deaths are teachers.
3. In 1993, the average life expectancy of ordinary people in China was 72 years, while the average life expectancy of teachers was only 59.3 years, and the average life expectancy of teachers was 10 years.
According to the survey data of the whole country and some provinces and cities, with the advancement of society and the acceleration of social rhythm, the occupational morbidity rate of teachers has been increasing year by year, and occupational diseases have developed in diversified directions. Among them, dust pneumoconiosis caused by dust and various acute and chronic respiratory diseases are China. At present, the most important occupational disease is the most serious and widespread one. The prevalence of myopia in students has also increased year by year, to an extremely serious degree.
Because the chalk contains carcinogens, the China Center for Disease Control and Prevention shows that the cancer incidence rate of 38 million full-time teachers in China accounts for 20% of the total cancer incidence rate in the country, which is 8 times higher than that of the general population. So don't ignore the most common deadly threats around us. I did not expect the hero of education - chalk is the first culprit to endanger the health of teachers and students and damage the equipment of audio-visual equipment. The harm of chalk ash to the majority of teachers and students, the pollution of the environment and the violation of the audio-visual facilities are obvious to all. Breaking the tradition, the use of Shi'an environmental protection teaching board is imminent.
The eight advantages of Shi'an Environmental Protection Teaching Board
1. Low-carbon energy-saving: Shi'an board and pen teaching realize low-carbon teaching and achieve energy-saving and emission reduction;
2, environmental protection and non-toxic: Shi'an environmental protection teaching board pen ink does not contain harmful elements such as lead, cadmium, mercury, chromium, etc. harmful to the human body; it is conducive to the fresh air of the classroom, so that teachers and students get rid of dust pollution, can eliminate chalk Teacher-induced occupational diseases caused by ash;
3, the writing is clear: the writings written by the Shi'an environmental protection teaching board are covered with film, the brightness is high, and the writing is clear and smooth;
4, good writing and easy to wipe: Shi'an environmental protection teaching board writing pen writing in a few seconds to dry quickly, using dry wipe, easy to wipe, absolutely dust-free;
5, easy to write: Shi'an environmental protection teaching board writing pen is easy to write, can reduce the teacher's writing fatigue;
Valve structure, open the back cover of the pen to fill the ink, use it indefinitely, reduce waste; the material of the pen head is made of imported acrylic material, hard and wearable, and the water is smooth;
7, the color is diverse: Shi'an environmental protection teaching board book pen basic colors: white, red, yellow, blue, black and other colors.
8. Protection equipment: It can protect the audio-visual equipment, avoid chalk ash to cause equipment failure, extend equipment usage time, and greatly reduce the school's expenses in this regard.
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