3-Fluoro-5-bromopyridine

The 3-5 canal, its main use is for farmland irrigation, flood drainage and water transportation.
In terms of farmland irrigation, this canal diverts water from rivers and winds to vast farmland. Like the veins of the earth, it transports the source of life for crops. In the dry season, the scorching sun hangs high, the soil is cracked, and the canal water is injected into the fields like a savior, so that the seedlings are rejuvenated and the grain is abundant. The people take food as their heaven, and the contribution of this canal to agricultural irrigation is actually related to the livelihood of the people.
The issue of flood drainage is crucial. When a rainstorm pours and rivers flood, it becomes a barrier to prevent floods. It uses a wide waterway to introduce too much water into other places to avoid floods and protect the safety of people's homes and fields along the coast. If this canal is missing, when there is a flood, Wang Yang will be a piece, people and animals will be displaced, and the losses will be heavy.
On the water transportation, the canal is also of great use. In ancient times, transportation was inconvenient, and boats were an important mode of transportation. This canal connects all places, making the flow of goods smoother. Merchants travel ships, carrying specialties from various places, and trade. Goods from the north and the south can be exchanged, promoting economic prosperity. Such as grain, silk, porcelain, etc., are transported to all parties through this canal, and cultures from all over the world also converge with the flow of people, blending and developing.
In short, the 3-5 canal plays an irreplaceable role in agriculture, flood control and transportation trade. It is actually an important water conservancy canal that benefits the country and the people, laying a solid foundation for the prosperity of one party.

If you want to make a 3-way-5-way object, there are three ways.
One is the method of gathering sand into a tower. First look for clean sand, sieve it, and remove its gravel impurities. Then on a flat ground, use water and sand to make it sticky. According to the shape of the utensils made, mold it by hand or mold, and initially form a green body. Place the green body in a ventilated place to dry in the shade, wait for it to be slightly hard, and then move it to a low fire and bake it slowly. During this time, you need to turn it frequently to prevent it from burning. In this way, you will get 3-way-5-way utensils. This is an ordinary method. The required materials are easy to find, but it is time-consuming and laborious, and the fineness of the utensils depends entirely on the craftsmanship of the craftsman.
The second is the method of casting molds. First carve stone or wood into the mold of the object to be made, and the shape of the mold must be accurate. Find suitable metals, such as copper and tin, and put them in a furnace to melt. When the metal is melted into a liquid state, pour it into the mold, let it stand on the ground, and wait for it to cool and solidify. Carefully remove the mold. If there are any defects, polish and trim it with files, sandpaper, etc. The product produced by this method has a regular shape and high precision. However, specific furnaces and metal materials are required, which is expensive.
The third is the method of kneading. Choose the clay with fine texture, soak it in water and twist it to make the clay soft and even. According to the shape you want, knead it by hand, or supplement it with simple tools, such as bamboo slices, knives, etc., to shape the details. After molding, air dry naturally first, and then enter the kiln for firing. When firing, you need to control the heat and time. If the temperature is too high, the utensils will be deformed, and if the temperature is too low, the texture will be loose. After leaving the kiln, if you feel that the color is not good, you can apply painting or glazing. The utensils made by this method are full of artistic atmosphere, but the quality of the clay and firing skills are very demanding.

3-Tunnel and 5-Tundra are both related concepts of water flow, and their physical properties have the following characteristics:
1. ** Fluidity **: Both are as constant as water, with a state of flowing without living. Water is the most soft thing, but it can pierce stones. 3-Tundra and 5-Tundra water also have this property. The flow trend may be slow or rapid, depending on the terrain. When it is slow, it is like a ribbon winding, which can moisturize the land along the way; when it is urgent, it is like a galloping horse, with the power of initialization, which can move sand and stones.
2. ** Connectivity **: Although the scale of the water flow is different, it is in the water system, or connected to streams, rivers, etc. Although the 3-canal is small, it may be a part of the field water network, which gathers small water flows and is connected to larger channels. 5-Dudu, as a large river, is the key to the water system veins and interconnects with many tributaries to form a complex water network system and maintain the regional hydrological cycle.
3. ** Seasonal changes **: Affected by factors such as precipitation, its water volume varies seasonally. During the rainy season, the precipitation is abundant, and the amount of 3-canal and 5-canal water increases greatly, and the water flow is turbulent. For example, in rivers in the north, after heavy rains in summer, the torrent in Dudu is rolling and overflowing; in the dry season, the water volume decreases, and even part of the canal will dry up. The water level of Dudu also drops sharply, and the water flow slows down, showing a state of dry water.
4. ** Carrying materiality **: During the flow of water, it will carry sediment, nutrients and other substances. 3- In the fields, or with soil, fertilizers, etc., it affects the fertility of farmland soil; 5- It flows through a wide area, and the sediment and other substances it carries accumulate in areas such as the estuary, forming deltas and other landforms. At the same time, the nutrients it carries are also crucial for the biological reproduction and growth of estuarine ecosystems.

Between the shops in Guanfu City, the direction of the three branches and the Wujin, its price situation is quite worthy of investigation.
The land of the three branches is crossed by water and land, and the goods are exchanged and colonized. There are many categories. The price of its goods varies from time to time and changes according to demand. The merchants of the four quarters gather here, and the goods sold are either common for daily use or rare treasures. For daily use, the price is constant and stable, but when the weather is not smooth, the farmer's mulberry is damaged, and its price may fluctuate. As for rare things, it depends on the number of supply and demand. If it is a rare treasure, there are many seekers and few suppliers, then the price will rise and it will be unattainable; if the ordinary strange products are oversupplied, the price may be flat and easy to obtain.
Where Wujin is located, the mountains and rivers are victorious, and the products are unique. Its prices also have their own rules. The local specialties, due to the convenience of the geographical location, the initial price may not be high, but if the reputation is far-reaching, and the four sides compete for purchases, the price will rise accordingly. And in Wujin, the traffic is smooth, and trade with various parties is frequent. Goods from other places are imported, competing with local things. If foreign goods are of high quality and in sufficient supply, the prices of the same kind in the local area are subject to its control, and they have to be met with good prices in order to compete for market profits. On the contrary, if local specialties have unique advantages and foreign goods are difficult to access, the price can be independent, or it can be profitable.
Basically speaking, the prices of Sanchang and Wujin depend on the weather, geographical location, and personnel. The weather is related to the prosperity of farmers, and the geographical location affects the amount of property. Personnel depends on the change of supply and demand, and the business plan. If you want to know the details of its price, you should carefully observe the city and evaluate the situation in order to understand its situation. Between buying and selling transactions, you can get the benefits.

If you want to do something good, you must first sharpen your tools. There are many things that should be paid attention to in the storage and transportation of the three and five caverns.
The first site selection. Its land and water are easily accessible, which not only facilitates accumulation and storage, but also transports. If it is remote and difficult to reach by boat and car, it will be difficult to accumulate and transport, and it will be more difficult to work hard and difficult to achieve. Therefore, it is necessary to carefully observe the terrain of mountains and rivers, and choose the key points of transportation, so that the flow can be unimpeded and the goods can flow smoothly.
Furthermore, the method of protecting the collection. The things stored in the three and five caverns are of different types or varieties, and the nature is different. There are those who are not resistant to dryness and dampness, and those who are afraid of insects and rats Therefore, the storage place should be handled differently depending on the nature of the objects. Those who are dry should have a high and ventilated place, those who are wet need a moisture-proof and shady place, and insect-proof rats must be strictly guarded against their barriers, and equipment should be set up to prevent them. Make sure that the hidden items are not damaged or destroyed, and they are safe to be transported.
When transporting, equipment is also necessary. Boats and vehicles must be strong and intact before they can support things and travel far. And when you look at the number and weight of things, choose suitable equipment. For heavy loads, you need a big boat and a sturdy cart; for light ones, you can use a small boat and a lift. At the same time, those who operate the boat and the royal car must be very good at their skills, and they must be familiar with the dangers of water and dry roads, so as to ensure the stability of transportation, so as not to be lost in the middle.
Again, the weather is seasonal. Water transportation is suitable when the water is in full bloom. If it encounters a dry season, it will be difficult to travel on a boat, or even stranded. Land transportation is afraid of wind, snow and mud, and the road is difficult to pass. Therefore, it is necessary to consider the situation, choose a good time to carry out transportation, avoid its disadvantages, and make it convenient, so that the results can be multiplied with half the effort.
There are management rules. In storage, it is time to set up a book, and record the number of entries and exits in detail, so that there is a fixed number of things, and a special In transportation, it is also necessary to set up regulations, monitor its itinerary, and check its wear and tear. If there is any impropriety, it must be held accountable. In this way, everything will be orderly and will not be disordered.
All these are things that should be paid attention to during storage and transportation.