Fire safety tips. Liquefied petroleum gas cookers should not be placed in bedrooms, offices, balconies, warehouses, auditoriums and other public places to prevent air leakage and fire.
Second, correctly grasp the use of the switch, wait for the fire, don't wait for the fire, remember to turn off the valve and switch after use, and replace the valve in time if it is broken. Don't let children use cookers or play with switches at will.
Third, when using liquefied gas, someone should look after it and stay away from it. Pay attention to adjust the size of the rotor at any time to prevent the soup from overflowing and extinguishing the flame or being blown out by the wind, resulting in air leakage. Fourth, liquefied gas tanks should be upright, not upside down, and cannot be cooked or roasted with fire.
5. If there is air leakage, measures should be taken immediately: open doors and windows, ventilate with a fan (but not an electric fan), and then find the leaking part. Basic knowledge of fire fighting (1) isolation method: this is a method to eliminate combustible materials.
(2) Asphyxiation method: prevent air from flowing into the combustion zone, reduce the oxygen content in the air, and make the fire source go out under the condition of insufficient oxygen. (3) cooling method: spray water or other fire extinguishing agents on the combustible materials to lower the temperature of the combustible materials below the ignition point and force the combustion of the materials to stop; Or spray water and fire extinguishing agent to combustible materials near the fire source to reduce the temperature of combustible materials and avoid the expansion of the fire.
2. What handwritten newspapers are there about scientific knowledge?
Life-related primary school science knowledge: 1, raw jiaozi will sink, cooked will float, because hot air is lighter than cold air; Adding salt can make potatoes and eggs float. Salt is added to increase the density of water; 3. Parachutes made of plastic film can stay in the air for a long time because there is updraft at the edge of tall buildings; 4. We can see the blue sky because blue light has the strongest penetrating power in sunlight; 5. Magnifier can burn paper because convex lens can focus; 6, the compass can guide, because the south is the north pole of the geomagnetic field; 7. The chain is wound around the wheels driving in the snow to increase the friction; 8. There are fewer and fewer stars at night, because the universe is still expanding; 9. Plants have the functions of making oxygen, absorbing dust and noise, reducing the surrounding temperature, resisting sandstorms and consolidating soil and water, so we should plant a variety of trees and grasses; 10, air conditioning, automobile exhaust, cement floor and a large number of houses are the chief culprits of the greenhouse effect.
Scientific achievements: 1, BIGBANG was born13.7 billion years ago; 2.BIGBANG produced a high temperature of 65.438+000 billion degrees; 3. Galaxies and stars are formed by nuclear fusion in which a large amount of hydrogen attracts nebulae to produce helium; The sun was born 4.5 billion years ago; 5. The earth was born 4.47 billion years ago; 6. The moon was hit by an ancient planet and flew out from the bottom of the Pacific Ocean; 7. Most planetary nuclei in the solar system are liquid; 8. The water and life elements on the earth come from the ice meteorites in the universe; 9. The earliest E79FA5E98193E59B9EE7A94313336366237 Life on the earth was cyanobacteria, and the earliest animal was sea mother: 10, human evolution history: spiny fish (prehistoric shark 500 million years ago)-Triceratops (3
3. Encyclopedia of first-year scientific knowledge
Small scientific knowledge
1. Rabbits beat the ground with their legs to send messages. Most of them beat the ground with their hind legs, which is a way for them to express their feelings to the female rabbits.
2. The biggest monkey in the world is a baboon and the smallest monkey is a bonobo.
3. The real name of "Four Elephants" is Elk, which is a rare animal in China.
4. Why does sorbet get angry?
The reason why sorbet bubbles is because there is a lot of invisible water vapor in the outside air. When it comes to cold sorbet, it will liquefy into droplets when it is cold. It seems that the sorbet is bubbling.
5. Why do sunflowers always face the sun?
Sunflower stems contain a wonderful auxin. This auxin is very afraid of light. When it is illuminated, it will go to the backlight side, and the cells on the backlight side will multiply rapidly. Therefore, the backlit side will grow faster than the bright side, which will bend the sunflower to light.
4. Scientific knowledge handwritten newspaper
Why do most household appliances such as electric fans, washing machines and refrigerators use three-wire plugs? What is the difference between a three-wire plug and a three-phase plug? Three-phase electrical appliances refer to three different live wires, and the voltage between each two wires is 380 volts. They are generally used in power systems and are more common in industrial electricity consumption.
Single-phase power supply is generally used in household appliances, and its three wires are live wire, neutral wire and ground wire. The voltage between the live wire and the neutral wire is 220 volts, so this is not three-phase electricity, and its plug socket is not a three-phase plug socket. The grounding wire is to ensure safety. Fruit hawthorn with antihypertensive effect; Hawthorn can dilate blood vessels and lower blood pressure and cholesterol.
You can choose 10 wild hawthorn (fresh is better), mash it with 30 grams of white sugar, and take it after decocting in water, which has a good effect of lowering blood pressure and invigorating stomach. Bananas; Bananas contain a variety of vitamins, which can clear away heat and lower blood pressure and can be eaten regularly.
It is also effective to decoct with 30~60 grams of banana peel or fruit stalk. Take a proper amount of plantain flowers and take them with water, and the curative effect is better.
Water chestnut; It has the effect of clearing away heat and lowering blood pressure. You can use fresh water chestnut (washed, mud removed) and jellyfish (washed and salt removed) to cook soup three times a day.
It can not only lower blood pressure, but also reduce phlegm and relieve cough. Pineapple basket: Eating pineapple regularly can strengthen the hydrolysis of fibrin in the body, which has a good effect on improving blood circulation and eliminating edema and inflammation in hypertension, edema and thrombosis.
Mume: Rich in citric acid, malic acid and succinic acid. For those with hypertension, dizziness, insomnia and difficulty sleeping at night, 3 pieces of ebony and appropriate amount of rock sugar can be stewed with boiling water, which has the functions of lowering blood pressure, sleeping peacefully, clearing away heat and promoting fluid production.
Apple: It contains malic acid, citric acid, vitamins A, B, C, etc. 10. Eating apples often can improve arteriosclerosis. Scientific tips for drinking milk are beneficial to health, but many people still have some conceptual misunderstandings when drinking milk. Here are some tips for drinking milk scientifically.
1. It is not advisable to drink milk on an empty stomach in the morning. Because the gastrointestinal peristalsis is fast when the human body is on an empty stomach, the nutrients in milk often rush into the large intestine before being absorbed.
In addition, the method of swallowing milk is not feasible, because it will reduce the chance of mixing with saliva in the mouth, which is not conducive to digestion and absorption. You'd better eat some biscuits, cakes, etc. Before drinking milk, or eating snacks while drinking milk.
Drinking milk at night is more beneficial. Scientific research has found that there is a special law of calcium metabolism in human body: at night, especially at midnight, the plasma calcium content will appear a "trough", forcing the body to transport part of calcium in bones to supplement it through regulation mechanism.
Although this temporarily maintains the calcium in the blood, the calcium in the bones is reduced. Milk is rich in calcium. Drinking a glass of milk before going to bed can compensate the body's demand for calcium at night.
Milk should not be cooked with sugar. Milk is rich in amino acids. At high temperature, lysine in milk reacts with sugar to produce a new compound-fructosyl amino acid.
This substance can't be digested and absorbed by human body, but it affects human health. It is best to drink fresh milk. If it is too cold, you can heat it a little. If you don't like milk, you can drink yogurt.
Most people who hate milk suffer from lactose intolerance. These people can try to drink yogurt. The lactose content in yogurt is greatly reduced, but almost all the nutrients in milk are retained. Among them, lactic acid bacteria can survive and reproduce in human body, which is beneficial to the absorption and utilization of nutrients and improves immunity.
Yogurt contains no antibiotics, is easy to digest and absorb, and can be drunk on an empty stomach. 5. Yogurt can't be heated for drinking.
Drinking yogurt is mainly about eating its nutrients and living bacteria. For example, when yogurt is heated, the human body can only drink nutrients but lose bioactive lactic acid bacteria, so don't drink it after heating. Mercury is the smallest earth-like planet in the solar system.
It is difficult to observe because it is blocked by the strong light of the sun. On his deathbed, Copernicus regretted that he had never seen Mercury in his life.
Since the 1970s, people have learned more about water quantity. Mercury is the smallest earth-like planet in the solar system.
It is difficult to observe because it is blocked by the strong light of the sun. On his deathbed, Copernicus regretted that he had never seen Mercury in his life.
Since the 1970s, people have learned more about water quantity. Mercury is the closest to the sun, only 57.9 million kilometers, which is 0.387 times the distance between the sun and the earth. Mercury's equatorial radius is about 2/5 of that of the earth.
Mercury has no air. Mercury looks very similar to the moon, and its surface is covered with craters of all sizes.
Volcanic activity may have occurred hundreds of millions of years ago. Now there are several plains that look like volcanic lava on the surface of the star, and there are craters everywhere, large and small. Mercury has a huge concentric structure with a radius of about 1300 km. It is located at 30 degrees north latitude and 0/95 degrees west longitude of Mercury. Because it is extremely hot, it was named "Calorie Basin" by scientists.
There are more than 100 craters with radial stripes on the surface of Mercury, and a large number of cliffs three or four kilometers high, some of which are hundreds of kilometers long. The density of mercury is close to that of the earth.
Its center may be a core of iron and nickel similar to the size of the moon, and it also has a magnetic field, but its intensity is only1100 of that of the earth. Mercury's orbital speed is 48km/s, which is faster than the Earth's 18km.
It only takes 88 Earth Days, and less than three months after the Earth, Mercury will be 1 year. However, Mercury's "day" is very long. Mercury rotates 1 nearly 58.65 earth days, which means that 1 day of mercury is nearly two months of the earth, and only two sunrises and sunsets can be seen in 1 year on mercury.
Mercury, like Venus, has no satellites.
5. Popular science knowledge handwritten newspaper content
The charm of science is everywhere. As long as we take the initiative to explore with curiosity, we will find many interesting phenomena in life, such as the following 10 knowledge, which will definitely make your posture soar.
1. The largest monkey in the world is a baboon, and the smallest monkey is a bonobo. Baboon 2. By yawning and deep breathing, the human body increases the oxygen in the blood and discharges more carbon dioxide, thus making people more energetic.
When people are sleepy, they often yawn constantly to remind people that their brains are tired and need sleep and rest. People can drink about 80 tons of water in their lifetime.
Note: If a person lives to 60 years old, he will drink about 43,500 kilograms of water in his life, that is, if he drinks 2 liters (kilograms) of water every day, 60*365 days *2 kilograms = 43,800 kilograms, minus about 300 kilograms in infancy. Needless to say, you have to drink 80 tons of water to live to 60 years old. 4. The brightest star in the sky is Sirius Canis, with a magnitude of-1.46 and a distance of 8.7 light years from the Earth. Everyone must have the habit of picking their noses.
According to the survey, 90% people put their fingers into their nostrils several times a day. According to research, picking your nostrils may introduce dangerous bacteria into your nostrils, such as Staphylococcus aureus.
6. Morning glow and sunset glow are the most beautiful colors in the sky. It is formed because sunlight passes through the thick atmosphere around sunrise and sunset and is scattered by a large number of air molecules.
7. There is always lightning in Lake Maracaibo in Venezuela. Even scientists don't know why, but it seems that lightning is caused by airflow combined with local topography. There used to be giant dragonflies in ancient times.
The giant vein dragonfly appeared about 300 million years ago, about as big as a seagull, and its wings are about 65 cm long. 9. Lobsters die from molting, being eaten or being injured. They can live to be 70 without getting old first. If these three things don't happen, we can continue to live forever.
10, "White rabbit, white, so cute to jump". Rabbits beat the ground with their legs to transmit information, mostly with their hind legs, which is a way for them to express their feelings to female rabbits.