2-iodopyridine-3-ol

Mercury is very different from all things. It is a liquid state, at room temperature, it is only slippery, shining with light, like silver liquid pouring, flowing amorphous, difficult to touch, rolling freely.
Mercury is toxic and can quietly harm. Although invisible and odorless, once it invades the human body, or through breathing, or through skin contact, it can damage the viscera. The viscera are damaged by it, and the light ones are dizzy, weak, and sleepless, and the heavy ones are dizzy, endangering life. Throughout the ages, there have been many people who have been sick due to mercury poisoning.
The chemical activity of mercury also has its own unique features. It is easy to vaporize in case of heat, curling and rising, and mixing into the air. And it can be affinity with many metals to form amalgam. If it encounters precious metals such as gold and silver, it can fuse and change its physical properties. During chemical reactions, mercury can often participate in redox changes, and its valence is also variable, either + 1 valence or + 2 valence, showing different chemical behaviors in different reaction situations.
Furthermore, mercury compounds also have a wide variety of products and different properties. Such as mercury sulfide, which is red and bright in color and hard in texture, is often the choice of pigments; mercury chloride is highly corrosive, and has its own uses in chemical experiments and industrial production. However, it needs to be treated with caution. Because of its strong toxicity, a little carelessness can lead to disasters.

In the midst of such reactions, it can be used as a countermeasure. As mentioned in the "Heavenly Works", the creation of all things in the world has its own uses.
In metallurgy, stone is an important countermeasure. Take the example, "Where there is a sea, there are red, brown, purple, and black, and the natives use it as a substitute for cooking." In the smelting of stone, the high temperature of coal, coke, etc. can be melted out. Among them, stone is an indispensable countermeasure, which is transformed, and the compounds contained in it are transformed into gold.
The method of making water, seawater or spring is also a countermeasure. "Where seawater has its own taste, its color and white are different." Seawater is introduced into the fields, and by natural forces such as day and blowing, the water is steamed and then precipitated. In this process, seawater acts as the starting reaction, providing the necessary components for making.
In the process of making plants, bamboo, hemp and other plant raw materials are the reaction. "Where bamboo is made, it is out of the south, and the province is prosperous. When it is born, look at the mountains and bamboo forests, and the young bamboo is cut, each root is measured in feet." Bamboo soaking, steaming, pounding and other multi-processes, and lime and other additives are generated, so that they can be divided and weighted, and the most effective. Bamboo and other plant raw materials are the fundamental reaction to the formation of the whole process.
Ceramic fabrication, clay is an important anti-material. "Every potter must take good soil." Clay is shaped, dry, and then put into high-quality fabrication. The interaction of factors such as atmosphere and temperature, the transformation of biological physics, and the transformation of hard and beautiful ceramic utensils.
In other words, it is a kind of material, water, or plants and soil. In various processes, it can be filled with anti-material, and it can be wonderfully transformed to achieve the ability of materials.

There are all kinds of wonderful ways to combine the tricks of the crossbow machine.
First of all, the selection of materials is discussed. The wood wants to be strong and tough, and the azalea and sandalwood are the best. The grain of the catalpa wood is fine, the texture is soft and tough, and it can withstand the relaxation force of the crossbow without folding; the sandalwood is hard and dense, and the performance is stable and durable. Both are good choices. For the tendons and horns, it is necessary to take the tendons of the strong livestock and air dry and tan them to make them flexible and elastic. The horns are based on the horns. After cooking, scraping and other processes, the oil is removed and the toughness is left, so that they can complement the tendons and wood.
The method of making the crossbow body, its shape should be smooth, and the lines should be smooth, so as to facilitate the holding force. The craftsman needs to be meticulously crafted to make the width of the crossbow body narrow and suitable for the length. On the crossbow arm, the scale must be accurate, which is related to the distance and proximity of the range, the density of the hit, and the difference in the slightest is thousands of miles, so it is necessary to use rules, moments, quasi, ropes and other utensils to measure repeatedly, not less than a millimeter.
The key to the crossbow machine lies in the teeth, hanging knives, and Wangshan components. Cast teeth, when made of bronze, the copper-tin ratio should be just right. More tin is hard and brittle, easy to fold; less tin is soft but not firm, and it is difficult to bear the weight of the crossbow opening and closing. When casting, the control of the heat is also the key. If the fire is fierce, the copper liquid will flow over, and it will be difficult to form a fine shape. If the fire is small, the copper will be impure, which will affect the firmness of the crossbow machine. The shape of the tooth, when imitating the benefits of animal teeth, has a precise curvature, and can be tightly fastened to the bow string, without taking it off.
The hanging knife is like a human finger, which controls the launch of the crossbow machine. Its design needs to be easy to pull, and the strength is moderate. The craftsman uses ingenuity to refine, so that the hanging knife and the crossbow body are connected naturally. When pulling, it is smooth and unobstructed, and wherever the force is, the string will move the arrow.
The person looking at the mountain is the tool of aiming. Its height and angle are related to the trajectory of the arrow. When making, it needs to be precisely calculated according to the power of the bow and crossbow, the shape of the arrow, and the range. On the lookout mountain, there are also scales, such as stars, to help the shooter to adjust accurately according to the distance and proximity, so as to achieve the effect of accurate hit.
When assembling, all parts need to be tightly sewn. For those who are joined by mortise and tenon, the size of the tenon and the depth of the mortise need to be fitted; for those who are connected by nail and riveting, the thickness and length of the nail and riveting should also be appropriate. After assembly, repeatedly debug, relax the bow and crossbow, test its elasticity, and see if its parts run smoothly. If there is any hindrance, repair it immediately.
All these kinds of combined methods require the craftsman to be in awe, with exquisite hands, with the power of time and concentration, in order to cast a good crossbow and show its power on the battlefield.

Mercury, its physical properties are very different. Mercury is a liquid metal at room temperature, which is its remarkable characteristic. All kinds of metals are mostly solid, but mercury exists in a liquid state, warm and flowing, shiny, like silver liquid, smart and lively.
The density of mercury is quite large, and the feeling of heaviness is significant. Take a little mercury and put it in the palm of your hand, and you will feel that it is more than normal. Its density makes mercury unique in many applications. If it is in a specific container, mercury takes on a different form due to its density.
Furthermore, the melting point of mercury is very low, only -38.87 ° C, and it is invisible when it is slightly warm. And its boiling point is not very high, about 356.6 ° C. Such a melting boiling point makes mercury often liquid at ordinary temperatures. When the temperature changes, mercury can quickly change its state with temperature, which is widely used in scientific research and industrial thermometer manufacturing.
The surface tension of mercury is quite large. In a flat place, mercury drips but does not disperse, like a round pearl, rolling freely, and not easy to attach to other objects. This property also makes mercury exhibit special behavior in specific operations and experiments.
Although mercury has the luster of a metal, its electrical and thermal conductivity is slightly inferior to that of other common metals. Although it can conduct electricity and heat, it is not a good conductor, which is also one of the unique physical properties of mercury.
Mercury has such special physical properties that it has played an important role in many fields such as alchemy, medicine, industry, etc. It was explored and applied by the ancients and laid a certain foundation for the development of science in later generations.

The Second Artillery Artillery is the old name of the Rocket Army today. Its application field is extensive, it is related to the security of the country, and its role is crucial.
In the field of military operations, the Second Artillery Artillery has the ability of strategic deterrence. Its missiles are powerful and have a long range, and can precisely strike the enemy's key targets, such as military bases, command centers, and strategic facilities. In wartime, it can break the enemy's strategic layout, frustrate its sharpness, and strive for strategic initiative for our side. And at the level of nuclear deterrence, the nuclear missile force of the Second Artillery Artillery is the core of our country's nuclear counterattack, ensuring that other countries do not dare to start a war lightly and safeguarding our country's sovereignty, security, and peace and stability.
In terms of national defense strategy, the Second Artillery is an important support for our country's defense system. Construct a multi-level and all-round strategic defense barrier, which can effectively deal with security threats from different directions and forms. With advanced missile technology and precision strike capabilities, it forms a strong deterrent to potential opponents, so that they do not dare to provoke wantonly, and protect our country's territory and people.
In the transformation of modern warfare forms, the Second Artillery also plays a key role. With the development of science and technology, warfare tends to be information-based and precise, and the information-based combat capabilities of the Second Artillery continue to improve. It can cooperate with other military services to achieve joint operations and improve overall combat effectiveness. For example, in terms of information support and firepower strikes, it echoes each other with the Air Force and Navy to build an integrated combat system.
In addition, at the level of national diplomacy, the strong strength of the Second Artillery has added confidence to our country's diplomacy. It makes our country more powerful on the international stage. In diplomatic negotiations and international affairs, it can better safeguard national interests, demonstrate the responsibility of a major country, and safeguard national dignity and sovereignty. In short, the Second Artillery has irreplaceable and important applications in military, national defense, diplomacy and many other fields.