pyridine-2-carbaldehyde oxime

The main use of aphid fly wings is recorded in "Tiangong Kaiwu", which is related to flight and survival.
The aphid fly, as well as insects, has its wings in flight, which are crucial. With the power of its wings, the aphid fly can freely travel in the air, or shuttle between flowers, or rush in the forest. This flight ability is for the convenience of foraging for food. Insects and insects in the world rely on food for survival, and the aphid fly is no exception. Its wings can carry its body and find all kinds of food resources, such as pollen, nectar and other nourishment, to maintain life.
The second is about avoiding enemies and surviving. Between nature, the weak prey on the strong, and danger is everywhere. The aphid fly is weak and often coveted by other things. However, its wings can help it quickly fly out of danger and avoid the pursuit of natural enemies when it encounters enemies. This is a great plan for survival.
Furthermore, wings are also related to the reproduction of the aphid fly. Male and female aphid flies want to meet and complete the heavy task of reproduction. The wings can help them cross the gap of space and find a good mate. At the right time, they can fly to the other place with their wings to achieve reproduction and make the population continue endlessly.
Therefore, the wings of the aphid fly are the key to foraging, avoiding enemies, and reproduction. They are an indispensable and important organ for their survival and reproduction. They play a very important role in their life process.

The scales of the sharks are very different in their physical properties, which can be studied in detail.
The scales of the sharks are strong and tough. They are strong and can resist the invasion of foreign objects. The warriors of ancient times, or take the scales of the sharks as armor, and when they are in battle, it is difficult for knives, guns and arrows to enter, and they can protect the body in dangerous places. This shows its strong function. And its toughness, although it is hit hard, it will not be brittle and broken, and it can be kept safe.
The color of the scales of the sharks is mostly dark, like the darkness of night, or like the silence of the abyss. This color is not only beautiful in appearance, but also practical. In the water, the dark color makes the sharks blend with the deep realm, concealing their body shape, avoiding the spying of natural enemies, and facilitating them to sneak close to their prey and catch them unexpectedly.
Furthermore, the weight of the sharks' scales is moderate and appropriate. If it is too light, it is difficult to be a shield, and if it is too heavy, it will tire their body and cause them to move slowly. Its moderate weight makes the sharks swim freely in the water, which can not only obtain the protection of the scales, but also does not hinder their agility. In the current, they can follow the trend and swim, tossing and turning, and are very agile.
The scales of the sharks are also strange when they encounter water and fire. Fiery, non-combustible and heat insulation, if the device is placed on the side of the fire, it can protect the human hand from being burned; immersed in water, it is non-corrosive and hydrophobic, and it has been in water for a long time without damaging its quality. This is its unique physical properties. Therefore, the nail scale is very useful in the process of making and protecting utensils, and can be a precious material in the hands of skilled craftsmen and benefit the world.

Lead and mercury, the beauty of hardware, the honor of eight stones, its chemical properties are unique and quite wonderful.
Lead, blue and gray, soft and heavy. Under normal temperature, it is stable and not impatient, but in case of strong heat, it melts into a liquid, flowing like water. Its nature is lazy, and it is difficult to quickly merge with various things. However, in specific circumstances, it can also respond to acids. In case of dilute sulfuric acid or dilute hydrochloric acid, it slowly generates hydrogen and turns into lead salts. And lead is easy to interact with oxygen, and gradually oxidizes lead in the air. It is covered by its surface, like a protective film.
Mercury, also known as mercury, is the only metal that is liquid at room temperature. The silver light flickers and is abnormal in agility. Its boiling point is quite low, only 357 degrees Celsius, and it is easy to vaporize into mercury vapor when heated. This gas is highly toxic, so be careful. Mercury activity is not weak, and it can form amalgam with many metals, such as sodium, sodium amalgam, which is very active. It can also be combined with sulfur quickly, and mercury sulfide can be melted immediately after research. This is a way to remove mercury toxicity. And mercury in solution can be replaced with metal salts such as copper and silver. In case of copper sulfate solution, copper precipitates out, and mercury enters the solution to form mercury salts.
Both lead and mercury were often important in ancient alchemy techniques. Warlocks thought that they could refine the elixir of longevity, but eventually caused many disasters due to toxicity. In today's world, although its use is decreasing, it still has its place in the chemical industry, instrumentation and other industries. When we use it, we should observe its nature and avoid its harm, which is the right way.

The method of making acetonitrile has been used throughout the ages, and all kinds of means have their own wonders. Let me tell you one by one.
First, it is made by dehydrating ammonia acetate. Ammonia acetate is placed in a suitable vessel and dehydrated to obtain acetonitrile. This is a classic method. The reason is to use the characteristics of ammonia acetate to dehydrate water molecules under specific conditions and convert them into acetonitrile. The process is relatively simple, but it is necessary to precisely control the temperature, pressure and other conditions to achieve the best conditions.
Second, the reaction of sodium cyanide and haloalkane can also obtain acetonitrile. The haloalkane and sodium cyanide are chemically reacted in a suitable solvent, and the halogen atom is replaced by a cyanyl group to form acetonitrile. In this process, the choice of solvent is crucial, and it is selected to promote the reaction without impurities. At the same time, sodium cyanide is highly toxic, and when operating, it is necessary to be careful and strictly follow the procedures to ensure safety.
Third, acrylonitrile byproducts are also one of the sources of acetonitrile. During the production of acrylonitrile, acetonitrile byproducts will be generated. This is the utilization of by-products in chemical production. After fine separation and purification, pure acetonitrile can be obtained. This approach relies on the production of acrylonitrile, which has its convenience in obtaining raw materials. However, the separation and purification process is complicated, and superb skills are required to obtain high-purity acetonitrile.
Fourth, acetonitrile is prepared by ammonia oxidation. Appropriate hydrocarbons are used as raw materials to react with ammonia and air under the action of catalysts. This reaction process is complex and involves many reaction steps and conditions. Factors such as catalyst performance, reaction temperature, and gas ratio all have a great impact on the yield and purity of acetonitrile. However, if it can be properly regulated, it is also a good method for preparing acetonitrile.
All these methods for preparing acetonitrile have advantages and disadvantages. In practice, when considering factors such as own conditions, availability of raw materials, cost considerations, and product purity requirements, weigh the advantages and disadvantages and choose the best method to achieve efficient, safe, and economical production purposes.

When using the armored crossbow tool, everyone should pay attention to it.
First, when making, you must choose good materials. The leather of the armor needs to be tough and thick, which can withstand arrows and swords; the wooden body of the crossbow, when the texture is straight and the material is strong, can be used accurately. If the material is not good, the armor is easy to break, and the crossbow is difficult to reach far. When it is in battle, it is in danger.
Second, repair and maintenance, do not slack off. The interlocking of nail pieces should be inspected frequently, so that they should not be loosened and fall off; the mechanical parts of the crossbow should be oiled and lubricated on time to prevent rust. And after use, it must be cleaned to remove its dirt, so that the equipment will not be damaged for a long time, and there will be no worries about failure in wartime.
Third, the method of handling must be practiced diligently. Those who use armor know that it is easy to wear and take off, move freely, and can move flexibly between battle formations; those who use crossbows know how to open the string and buckle the machine, aim at the trick of firing, practice makes perfect, and then they can respond to the enemy. Otherwise, although there is a crossbow, it cannot be used, and it is the same as nothing.
Fourth, the storage place must be dry and ventilated. If it is in a humid place, the armor is perishable, and the crossbow is easy to rust. And it should be used to prevent rodent bites, so as not to damage its vital parts.
Furthermore, when using a crossbow, when judging the situation. When facing the enemy, depending on the distance and closeness of the enemy, choose the protection of the armor, and the launch of the crossbow. Do not move blindly, lest you be attacked by the enemy in vain.
All of these are for when using a crossbow, you should pay attention. If you use it properly, the armor can protect the body, and the crossbow can control the enemy, which is more beneficial in war.