High school science and technology composition 800 words 1
The improvement of productivity is related to many things. For example, nowadays, people can use smart phones to do many things, such as playing games, using electricity, and using mobile phones for TV. In the past, PHS could only make phone calls, but now with the development of the times, people let the door go in the future.
Social development, I've seen this. In the past ten years when I was growing up, people began to get rich, and almost every family had a TV set. I think whether the changed life is benign or malignant depends on development. People have a father and son in a photo, and some simple functions, such as answering the phone and sending text messages, because smart phone technology is constantly changing our way of life. Take the mobile phone as an example. With the continuous improvement of the level, technology has changed people's fathers in order to let their sons see themselves surrounded by the audience. This is also related to the lifestyle of students after the development of science and technology.
These functions have changed people's lifestyles and enriched people's lives. Nowadays, many things are intelligent, and even household appliances can be turned on by intelligence. People's lives are becoming more and more convenient.
Technology has changed people's lives, but it has also brought a lot of troubles. The emergence of smart phones has poisoned children with games on mobile phones. Many high-tech crimes make it more difficult for the police to handle cases. Some immature technologies have caused casualties, such as driverless cars killing people. These things tell us that technology is a double-edged sword.
Take me for example, I got my first smartphone in high school. This makes me ecstatic that I have long wanted a mobile phone. So, after I got my smartphone, I started playing games with it, and this dozen made me addicted. So I began to indulge in games, resulting in poor eyesight and grades. I don't want to learn. A smart phone, originally used to facilitate people's lives, has become an obstacle to my life and affected my life. This is the trouble caused by people's improper use of technology.
Technology may bring trouble to others, but it is not all trouble. Many times, technology brings us a lot of help. If we use technology correctly and reasonably, then technology will only do us more good than harm. But if the disadvantages are inevitable and many, it is better to think about the correct use.
The development of science and technology has indeed changed people's lives, but whether this change is benign or malignant depends on whether people use it correctly. In this regard, I think we should make rational use of science and technology to promote the healthy development of life. Avoid improper use and reduce the consequences caused by improper use.
High school science and technology composition 800 words 2
Dear foreign friends, look, the white flash that flies by on the railway track; Fragrant streets and alleys; The countryside, which exudes earth and flowers, reveals the characteristics of China everywhere. When you come to China, you must not miss the high-speed rail, food and countryside!
At a speed of 350 kilometers per hour, this is the "China speed". China's self-developed high-speed rail has reached the highest speed in the world, which is the pride of China. "Safety, comfort and efficiency" became her label. It is not only her amazing speed that deserves praise, but also the highly developed internet has accelerated her development pace like a catalyst in this era of information explosion. The fast 12306 booking system provides a convenient way for people to book tickets online, saving the time and trouble of buying tickets at the window.
The high speed of high-speed rail is a combination of basic technology and high technology. This is a demonstration of China's development and a reflection of China's spirit. Hard-working, persistent, diligent, unswerving, more frustrated, more brave, this is the people of China, this is the spirit of China!
If high-speed rail is the pride of China, then food can be said to be another business card of China. In the new era, she inherits the tradition, constantly innovates, enriches and happiness people's lives.
There is a saying in China that "Food is the most important thing for the people". The self-sufficient small-scale peasant economy in ancient China provided superior conditions for the development of grain. In order to improve life, even ordinary ingredients can become strange and delicious in the hands of smart women; The palace, which occupies a variety of ingredients, makes the dishes more diverse and exquisite. Different regions have different dietary characteristics, forming eight distinctive cuisines. In the new era, people not only pursue taste and flavor, but also increase the new demand for nutrition. In the documentary "China on the Tip of the Tongue", the chefs performed various cooking techniques when frying, frying, boiling, frying and steaming. The fragrance seemed to overflow the screen to stimulate people's taste buds, which made people drool. China people's passion for food is not only China people's eager pursuit of exquisite life!
Go to the countryside of China! It is different from the prosperity of the city. Some of her are beautiful and neat, others are calm and gentle. Let's feel the poetic life of Tao Yuanming's "deep alley dogs bark, mulberry trees crow"!
Spring breeze, Xia Chan, autumn leaves, winter snow, most beautiful villages are like this, and the changes of the four seasons are so harmonious and distinct. The sun is not dry, the breeze is just right, and everything is so clear. When farming is busy, they are in full swing and help each other; Get together in your spare time and talk about life. The beauty of the countryside is not only the beauty of scenery and the natural freedom of life, but also the pursuit of a better life and the praise of the stability and prosperity of the motherland!
Travel in China, eat in China and travel in China. China's profoundness and infinite charm are worth exploring!
High school science and technology composition 800 words 3
Science is often attractive, science will never be explored, and it will always be fresh and interesting. For example, taking the floating egg experiment as an example, many people may know it, but the process of doing the experiment is far more novel than what I heard.
The experiment is simple. There are only four materials: big glass, salt, spoon and eggs. Simple as it is, you can get endless knowledge from it.
First, I picked up the kettle, poured half a glass of water into the cup, and then gently put the eggs into the water. After the egg sank to the bottom of the glass, it stopped moving and seemed to be resting.
Then I put 1 tablespoon of salt, and the eggs didn't move; I began to put the second spoonful of salt, and the eggs were still lying quietly at the bottom of the cup; I put down 6 spoonfuls of salt in a rage, and the eggs didn't live up to expectations and rose a little; Finally, I put 2 spoonfuls of salt, and the index of egg rise was higher.
I heard that other people's eggs can float in the middle of water, so I took them out, stirred the semi-finished salt water with a spoon and slowly put them in until the bottom of the cup was salted. At this time, the eggs kept floating up and down. I waited for a while, but the egg did not move and struggled to surface.
Finally, I poured the remaining 2 spoonfuls of salt into the water, and the eggs gradually surfaced. If I swim freely with a swimming ring, I will press the egg down with my naughty fingers and let go of my fingers, and the egg will soon float back to the water.
Why do eggs float? I got something from the computer: when an egg is just put into clean water, it will sink to the bottom because its specific gravity is greater than water and its buoyancy is less than its own weight; After salt is released, water dissolves the salt and the specific gravity of water increases. When the specific gravity of salt water is equal to that of eggs, eggs will float in the middle of water. Keep adding salt. When the specific gravity of salt water is greater than that of eggs, the eggs will float on the salt water and the top of the eggs will be exposed to the water.
The teacher told us in class that any object will be buoyed in water, and buoyancy is equal to the volume and weight of the water boiled by the object. This is the famous Archimedes principle, also known as the law of buoyancy. In fact, science and physics are similar when they grow up.
I was surprised that this little experiment contained so many theorems, which made me realize that science is of great significance to us besides relaxing and playing. I secretly made up my mind to study physics and study this interesting science in the future.
High school science and technology composition 800 words 4
The eyes are considered as the windows to the soul. They are the first of the five senses and one of the most important organs of the human body. They are very important to people's work, study and life. Everyone wants to have a pair of beautiful and intense eyes, but it is not easy to protect their eyes.
Pupils should protect their eyes from myopia, mainly by reading and writing in a correct posture, keeping their eyes at a distance of more than 30 cm from the book, not reading in strong sunlight and too dark light, not reading while walking or riding a bike, not reading while lying down, and not reading and writing for too long. Our school has carried out activities to let children have enough time for outdoor activities to protect our eyesight. In addition, we must insist on doing eye exercises and looking out of the window. Don't watch TV programs, operate computers and play video games for a long time; Nowadays, more and more people use computers to work and study. Even our primary school students should play online games for a while after finishing their homework, but not for more than an hour. We should keep the most appropriate posture. The distance between our eyes and the screen should be 40-50 cm, so that our eyes can look down at the screen horizontally or slightly, which can relax the neck muscles and minimize the exposed area of the eyeball. The light in the computer room should be suitable, neither too bright nor too dark. The posture of using the computer is also very important. Use an adjustable chair to make the center of the operator and the computer screen on the same horizontal line. When sitting, there should be enough room to put your feet. Don't cross your feet to avoid affecting blood circulation.
People who often use computers are prone to "dry eye", that is, when we use computers for a long time, people will feel tired eyes, blurred vision, dry or congested eyes, photophobia, pain, and even lose the ability to concentrate light. If you have dry eyes, redness, burning or foreign body sensation, heavy eyelids, blurred vision, or even eye pain or headache, you need to go to the hospital to see an ophthalmologist.
I saw on the internet that computer operators work in front of the screen for a long time, and rhodopsin on the retina will be consumed, and rhodopsin is mainly synthesized by vitamin A, so they eat more foods rich in vitamin A, such as; Animal liver, carrots, tomatoes, sweet potatoes, spinach, pea seedlings, etc. You can also work hard to protect your eyes from diet. Eating more fresh vegetables is also very beneficial to protect eyes, prevent eye diseases and improve eyesight.
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