2 Fluoro 4 Iodopyridine

In "Tiangong Kaiwu", it is said: "Where a mirror is cast, gray sand is used for the mold, and tin and copper are used for copper." In ancient times, mirrors were mainly used for many purposes.
One of them was a daily beauty tool. Although the ancients did not have the convenient mirrors of today, they relied on bronze mirrors to straighten their clothes and observe their makeup. Women get up in the morning to dress up, and the mirror is appliqued yellow. The bronze mirror reflects a beautiful face, helping them to dress up carefully and see people with a decent posture. Men also use mirrors to organize their appearance, showing dignity. For example, in "Mulan Poem", "When the window is used for cloud sideburns, and the mirror is yellow with flowers", it can be seen that the mirror is important in daily makeup.
Second, it is used for ceremonial sacrifices. In solemn and solemn sacrificial occasions, bronze mirrors are often used as important ceremonial devices. The ancients believed that it has the mysterious power to communicate with heaven and earth and gods, and can pray for well-being, eliminate disasters and avoid disasters. In the ancestral temple, bronze mirrors are displayed to represent respect and piety for ancestors and gods, hoping to be protected by them. Many ancient sacrificial sites excavated by archaeology, bronze mirrors are common funeral items or sacrificial items, which proves their key position in ceremonial sacrifices.
Third, it has decorative value. Bronze mirrors are exquisite in craftsmanship and exquisite in decoration, such as auspicious beasts, flowers and birds, cloud patterns, etc., with different shapes and lifelike. Or placed indoors, or hung on the wall, can add artistic beauty and cultural atmosphere to the space. The rich family decorates their residences with exquisite bronze mirrors to show their status. Literati and scholars often play with bronze mirrors to appreciate the beauty of their craftsmanship and taste their cultural connotations.
Fourth, it is an important gift in diplomacy and gifts. In exchanges between countries, or between people to express friendship, bronze mirrors are often given as precious gifts. Because of its excellent production and profound cultural meaning, it can express respect and friendship. On diplomatic occasions, bronze mirrors are used as gifts to convey peace and friendship; relatives and friends give bronze mirrors to each other, and also send good wishes.

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** 1. If you want to use gold to make this device, you can use fine gold. First, fill the required gold material with a crucible and place it in the middle. Calcined with fierce fire to make the gold melt liquid. Wait for the gold liquid to be filled, and enter the first good shape. This type needs to be carefully made according to the shape and size of the 2-%E6%B0%9F-4-%E7%A2%98%E5%90%A1%E4%B9%8B, or use clay or sand, so that the wall is smooth and fine. The gold liquid is cold and solidified, carefully take out the pieces, remove the attached molding sand, etc., and then polish and trim to make the surface of the utensil smooth and well-formed.
** Second, take the gold of the green *
, and match the gold and other gold in proportion. They are put into the mold together, so that the gold can be fused with high temperature. It is especially necessary to master the heat, the heat is appropriate, and the green soil is excellent. Enter the specific mold at the same time, and wait for cold molding. Because of the defects such as easy-to-produce pores caused by the green mold, it needs to be checked carefully, and the defects need to be repaired with tools such as grinding and grinding. The surface can be treated, such as using the chemical mold to make it generate a quaint texture, adding the taste of utensils.
** Third, use the pottery of the **
to remove the soil, the clay with good viscosity. First knead the clay evenly to remove the foam and foam. According to the mold of the 2-%E6%B0%9F-4-%E7%A2%98%E5%90%A1%, knead it by hand or use the help of the mold to form. Forming, the pottery billet is placed in the open and dry, and should not be exposed to avoid cracking. When the pottery billet is dry to a certain extent, enter the system. Control and manufacturing, if the degree of formation is just right, the pottery will be solid and durable. If it is finished, it can be painted, engraved, etc., to make it more beautiful.
** Fourth, use the wood of the **
to pick hard, corrosion-resistant wood, such as sandalwood, camphor wood, etc. First cut the wood into a rough shape with tools such as wood, axe, etc., and then carve it with the heart of wood, such as wood, etc. The carving needs to follow the quality of the utensils, and strive to flow, and the shape is realistic. After the carving is completed, the paint can be used to not only protect the wood, but also add light. The color of the paint can be selected according to the preference, or the color can be applied to make the wood 2-%E6%B0%9F-4-%E7%A2%98%E5%90%A1 more beautiful.

Mercury, also known as "white", has a special quality and many properties.
Mercury is in the shape of a liquid at room temperature, flowing like mercury, shiny, like silver pouring, this is its remarkable physical property. Its melting point is extremely low, only -38.87 ° C, so it is always liquid in normal temperature environments. And the boiling point is not very high, 356.6 ° C. This unique melting and boiling point characteristic makes it extremely useful in specific industrial processes and experiments.
Furthermore, the density of mercury is quite high, reaching 13.59 grams/cubic centimeter, which is even higher than that of most common metals. Due to its high density, it is possible to achieve different functions in a specific device by virtue of its gravitational effect, such as in a barometer, using the height of mercury to measure air pressure.
The surface tension of mercury is also very considerable, so that it converges and integrates round mercury beads on a flat surface, which is not easy to spread. This characteristic is sometimes reflected in the separation of substances and some precision measurement operations.
In addition, although mercury is a metal, its conductivity is slightly inferior to that of common metals such as copper, silver, gold, etc. However, in specific electrical devices and experimental situations, its conductivity is still available.
Mercury is volatile. Although the volatilization rate is slow, the accumulation of mercury vapor in a confined space can cause serious harm. If people breathe mercury vapor, it is easy to be poisoned and damage important organs such as the nervous system and kidneys. Therefore, when using and storing mercury, care must be taken to prevent its volatilization and diffusion.

Today there are two channels and four weirs. What is the price of the city? The price of the city varies due to various reasons, and cannot be generalized.
Those who observe the weir are the key to controlling water, and their construction is also necessary for materials and labor. Those who need materials, those who need materials, those who need materials, those who belong to the stone and wood, the workers, and the craftsmen. The quality of the stone is high, the wood is strong and the craftsman is skilled, and the labor cost is also thick. Moreover, the size and regulation of the weir are different, and the materials and labor are different, and the price is different. The weir uses a wide range of materials and more labor, and its price must be higher than that of the small weir.
As for the canal, digging the ground to pass water, it is also necessary to consider the number of earthworks and the length and depth of the ditch. There are many earthworks, which cost a lot of labor and labor, and there are also many materials for the elders of the canal. If the location of the canal is complicated and difficult to dig, its price will increase even more.
Furthermore, the supply and demand of the city also affects its price. If the time is busy with agriculture, and there are many people who need water to irrigate the fields, the weir canal is related to harvesting, and its price may rise. If it is waterlogging, there is no need to control water drainage, and the use of the weir canal is slightly slower, and the price may drop.
And the price of things in the market often changes with time. The abundance of years and the amount of materials are all related to the price. In a year of abundance, the price may be stable; in a year of shortage of materials, the price will be expensive.
Therefore, if you want to know the market price of Erqu Siyan, you should carefully review its materials and labor, observe its size and regulations, and measure the difficulty of its terrain. Only by observing the changes in market supply and demand over time can you obtain a more accurate price, which is difficult to determine suddenly.

The second and fourth year of marriage, when it comes to the journey of hiding, there is a lot to pay attention to.
The first place to hide is the environment. The place where things are busy and dry, the place where the tide is avoided. The tide is easy to cause rotten, and its quality is low. If it is lost, it will be stained in a few days, and if it is heavy, the text can be blurred and distinguished. And do not put it in a dark place with poor communication, to prevent the growth of bacteria, and it is also harmful to the environment.
In addition, prevention is also necessary. If it is damaged on the surface, it will be tired during the period, or it will be overlooked, and it will be cleaned up. If the method is not good, it will be easy to clean. Therefore, it is advisable to cover it with a dry and soft object, or use a special collection box.
It is very important to be safe and secure. The earth is fragile, especially in ancient times, and collision can cause damage. When sending it, it must be wrapped in soft materials, such as cloth and sea walls, so that it can be protected from severe shocks on the way.
The equipment also needs to be inspected. A solid and well-sealed container can not only prevent external objects from colliding, but also block external adverse factors. At the same time, people should also be careful to avoid rushing and shaking. It is important to stop.
It is necessary to pay attention to the environment, prevention and other things in order to ensure the integrity of the environment and make it worth extending.