1 3 Difluoro 2 Iodobenzene

The arsenic contained in "Tiangong Kaiwu" has two main uses. The first is used for agricultural deworming and rodent control. Cover arsenic is highly toxic and has a strong lethality to field pests and rodents. In the past, farmers suffered from pests and rodents, causing crop failure. The application of arsenic can effectively curb such disasters and ensure the abundance of grains. During deworming, an appropriate amount of arsenic is sprinkled on the field, and the pests will die when touched; rodents are often mixed with arsenic into bait, which is eaten by rodents, making it difficult to survive and contributing greatly to agricultural production.
The second is used in the field of medicine. Although arsenic is highly toxic, it can also be used as medicine after being delicately processed. Ancient healers knew its nature well and used it to treat sores, malaria and other diseases. In the treatment of sores, arsenic can eat carrion, detoxify and go out, making it easy to heal the sores; in the treatment of malaria, arsenic can regulate the yin and yang of the human body, remove evil and correct, and relieve the symptoms of malaria. However, due to the severe toxicity of arsenic, the dosage and usage must be accurate, and a slight mistake will endanger life, so doctors use it with extreme caution.
Arsenic played an important role in agriculture and medicine in the era of "Tiangong Kaiwu". However, due to its toxicity, it must be used with caution to obtain its benefits and avoid its harm.

If you want to make a two-string instrument, it is called a harp, and there are various methods, let me tell you in detail.
First, the selection of materials is the key. You need to take good materials, such as paulownia wood, which is light in texture and has good resonance, which can make the sound clear. Or catalpa wood, which is strong and has a unique sound, is the best choice for the instrument. The wood must be properly dried and free of flaws and scars, in order to lay the foundation of the sound.
Second, the shape needs to be carefully studied. The shape of the harp is divided into horizontal and vertical. Horizontal, the body of the piano is flat and slender, and the two ends are slightly tilted, resembling a boat. Vertical, the body of the piano is upright, tall and solemn. The curvature and width ratio of the piano body are all related to the sound. For example, the size of the speaker is related to the volume; the position of the chord axis is related to the convenience and accuracy of tuning.
Third, the method of stringing is also exquisite. The string material can be selected from silk, casing or wire. The silk string has a soft tone and is easy to break; the casing string has a mellow pronunciation and needs proper maintenance; the metal wire string has a loud volume and a bright tone. The thickness and length of the string need to be determined according to the scale, from bass to treble, and the strings gradually become smaller and shorter. When stringing, be sure to make the string tension even to ensure stable intonation.
Fourth, tuning skills. Listen to it with your ears, supplemented by a rhythm instrument correction. When tuning the strings, set the base tone first, and then adjust the other strings one after another according to the scale relationship. Listen carefully and repeatedly until the notes are harmonious and smooth, and the highs and lows are coordinated.
Fifth, the art of decoration. The harp is not only an elegant artifact, but also indispensable for decoration. It can be carved with exquisite patterns on the piano body, such as dragons and phoenixes, flowers, birds, fish and insects, to enhance its beauty. Or paint, the color should be simple and elegant, in line with the temperament of the musical instrument.
The maker of the harp, with a heart of awe, should integrate the skills of material selection, shape making, string stretching, tuning, and decoration into one, so that he can get the exquisite harp, so that its rhyme is long and passed on to future generations.

The second one is the borer. The borer is often small in green, blue in color, and soft in color. It is mostly on plants and feeds on plants. Its shape is slow, and it crawls in a creeping posture.
The borer is like a bee, black and brown in color, and has wings. Its waist is not good. It is good for nesting on walls, walls, etc.
The borer is weak and good for the borer. It is born with the food of plants and the protection of nature. And the borer is fierce, and its speed is fast, so that it can catch other things.
The ancients took the son of the borer and took the son of the borer, so there is the "son of the borer". However, if not, they will catch the borer, so that they can feed on their offspring. The borer catches the borer, hides in the nest, and eggs on it. When the eggs hatch, the young will be fed by the borer, and the big.
The borer is soft in nature, relying on plants; the borer is soft in nature, to catch the way. The two are in the midst of nature, each in its place, and together they play the wonder of life, both of which are the wonders of nature.

In the process of storing and transporting the sword, there are all things to pay attention to.
The first storage place must be a high dry and ventilated place. If the ground is humid, the sword will rust easily, and the sharp edge will be dull. The hiding place should be quiet, avoiding all kinds of vibrations and collisions, so as not to break the sword body and damage its sharpness and toughness. The placement of the sword is also exquisite, either hanging on the wall or placed on a rack, so that the sword body can be stretched and cannot be bent and pressed.
As for transportation, protection is essential. Wrap it with a soft object, such as cloth and felt, to slow down its collision force. Then use a solid wood as a box and fill it with soft objects, so that the sword will not shake firmly in the box. When carrying, everyone should be united, hold it steady, and do not neglect the weight or throw it at will.
And when storing and transporting, all kinds of water and fire should be avoided. Fire can melt a sword and destroy its shape, but water will rust its quality. If it involves long-distance transportation, you need to pay more attention to climate changes. In case of rainy and wet days, you should properly cover it and do not let the sword body be watered.
In addition, between storage and transportation, inspection is also essential. Regularly check the condition of the sword to see if it has rust or damage. If there are any minor flaws, repair it in time, so that the sword can be kept sharp and sharp for a long time, without losing the original intention of casting the sword, and pass it on to future generations and shine.

In today's world, the two world, the future of the city of Hu, and the expectations of the people. The use of Hu, its use, in the field of food, diet and other fields have extraordinary performance.
In the field of Hu, Hu has the same effect, which can solve the suffering of many diseases. Nowadays, the world's health is especially important, and the demand for Hu is increasing day by day. Due to its own characteristics, Hu will definitely be able to get a place in the market. And with the in-depth research, more of Hu can be developed or excavated, and its market prospects will be improved.
As for the diet, Hu can add a special flavor to the delicacies, which also has a certain value.
Furthermore, from the perspective of development, if the two places can be well-developed and integrated, they will be able to attract merchants from all over the world. And with the convenience of transportation and commerce, the two places will be able to circulate more widely in the city, and their market will not expand.

In the face of many problems, as long as they grasp the quality, are reasonable, and are attentive, their market prospects will surely be like the beginning of the rise, a bright field, and will certainly be able to stir up waves and thick profits in the business sea.