3 Fluoro 4 Iodopyridine

3-4-Nest, the way to combine it is that the ancients used wisdom to build the foundation, use natural things, and use exquisite skills to build it.
In the past, the mountains were low, and the forests were deep and the grass was dense. The ancients wanted to live in this nest, to avoid rain and prevent fierce rain. First build a suitable place, and the cliffs next to it are solid and can cover a side of the rain. It needs to be close to the water source, so it is used to draw water.
When the land is rough, take the trees from the mountains, and cut the pillars. The wood of the tree must be straight and straight, and it must be able to bear the weight of the nest. Use the vine or the vine to make the column, so that it can be solid. The vine kudzu needs to be thick, so that it can be durable.
The bottom of the nest is thick, and it is especially good if it is large and dense, and can be separated. On it is soft thatch, which makes people feel comfortable. The four walls of the nest are made of bamboo, and the bamboo strips are cut evenly and smoothly to prevent it from breaking. The bamboo walls are also made of rattan to make them firm.
The bottom of the nest is covered with a large piece of skin or skin. The skin is taken from the large, and the skin is made from the mountains and forests. Both have waterproof effect, so that the nest is dry. When covering the nest, pay attention to the, do not let rainwater enter.
And when entering and leaving the nest, use a ladder. The ladder is rough, and it is located outside the nest. People can climb the ladder and enter the nest to rest; in case of danger, they can also collect the ladder to protect themselves. In this way, 3-4-nests are completed, and the ancients lived here to reproduce, escape the world and live, and blend with nature. With the method of, create a place to live, and the wisdom of.

The three canals and the four canals have different physical properties.
The canals are also field waterways, and the water is mostly artificially diverted and gathered. The flow potential is relatively smooth, because it is limited by the fields, and the waterways may be narrow or shallow. The water is clear and turbid, often depending on the conditions of the surrounding fields. If the fields are fertile, agricultural activities are frequent, and the water may contain more sediment, fertilizers, etc., the water quality may be turbid; if the surrounding fields and acres are well planted and there are few agricultural disturbances, the water color will be clearer. The water temperature also varies with the season and the environment. In summer, the hot sun shines, and the water temperature rises easily, while in winter the cold wind blows, and the water temperature drops rapidly.
The blasphemers are called rivers, rivers, Huai, and Ji, which are large waterways formed by nature. Taking the river as an example, it originates from the mountains, gallops down, has a long process, gathers many tributaries, and has a huge amount of water. Its water flow is rapid, especially in the mountains, rivers and valleys, where the waves are turbulent and there is a tendency to overwhelm the sea. The color of the river water varies depending on the region. The upstream is clear, originating from the melting water of ice and snow in the mountains, and the water quality is pure; the middle and lower reaches are gradually muddy due to the acceptance of many tributaries, or through the densely populated and prosperous agricultural places, carrying sediment and debris. The same is true of river water. The water flow and water quality vary significantly in different river sections. Huai Water, recorded in ancient times, flows through a land with diverse landforms, sometimes smooth, sometimes turbulent, and its physical properties are significantly affected by terrain and climate. Although the situation of Jishui has changed today, it has unique properties in ancient times. Its water is clear and the flow is relatively stable. In the course of historical changes, the river may have changed, but some of its characteristics are still recorded in the ancient books.
In short, the three canals and four blades are different because of their formation reasons, flowing through the region, surrounding environment and other factors, and their physical properties vary widely. On the earth, each shows its unique style, and occupies an important position in the hydrological veins of the Chinese earth.

Mercury is one of the hardware, and its properties are unique.
Mercury is in the shape of a liquid at room temperature, shining brightly, like mercury cascading to the ground, flowing away indefinitely, which is different from other metals. Its texture is soft and can be easily deformed, but it also has a metallic luster, shining brightly.
Mercury is highly volatile, and it can slowly evaporate into mercury vapor at room temperature. This mercury vapor is colorless and odorless, but extremely toxic. If inhaled, it is easy to cause chronic poisoning, damage the nervous system, kidneys and many other organs, causing tremors, insomnia, memory loss and other symptoms.
The chemical activity of mercury also has characteristics. It can form amalgams with many metals, which are quite useful in metallurgy and other fields. Mercury can also react with oxygen. When heated, mercury will combine with oxygen to form red mercury oxide. At the same time, mercury can quickly combine with sulfur to form mercury sulfide. This property is often used in the treatment of mercury leakage to reduce the harm of mercury.
Mercury also reacts differently in acids. When reacted with nitric acid, it can form compounds such as mercury nitrate; however, it is difficult to react with hydrochloric acid, dilute sulfuric acid, etc., at room temperature.
Mercury has a high density, much higher than water. When placed in water, it immediately sinks to the bottom. Its boiling point is relatively low, only about 356.73 ° C, and it is easier to boil and transform into a gaseous state when heated.
Mercury has unique chemical properties and has important uses in many fields. However, its toxicity also warns the world that when using and disposing of it, it must be used with caution to prevent harm to the human body and the environment.

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty. The book is detailed in many fields, related to the application of 3-river-4-anchors, and there are corresponding records.
In the field of boat navigation, 3-river-4-anchors are widely used. It plays a significant role in inland navigation, such as the Yangtze River, which is wide and complex. When a boat wants to dock on the bank of a river, or temporarily rest in the center of a river, it needs to stabilize the boat to prevent it from being washed away by the current. With its unique design, the 3-river-4-anchor can penetrate deep into the mud after being thrown into the water, and firmly fix the boat with its own weight and grip. In a wide river like the Yangtze River with variable currents, its application is particularly critical, so that boats can be safely berthed under various current conditions.
In the field of marine fishing, 3-river-4-anchors are also indispensable. Vessels fishing at sea need to stabilize the position of the vessel for fishing operations after arriving at the fishing ground. The marine environment is more complex, with surging winds and waves. If there is no stable anchor, the vessel is easy to drift, affecting fishing efficiency and safety. 3-river-4-anchors can effectively resist marine wind and waves, allowing vessels to be relatively fixed in the fishing ground and ensuring that fishermen can carry out fishing work smoothly.
Furthermore, in the field of water conservancy engineering, the 3-river-4-anchor can also be seen. When building large water conservancy facilities such as bridges and dams, construction ships only need to be positioned at a specific location. The 3-river-4-anchor can enable construction vessels to accurately dock at the construction site and provide protection for the smooth progress of the project. It is sturdy and durable, and can withstand large external forces, meeting the strict requirements for vessel positioning in the construction process of water conservancy projects.
In summary, the 3-river-4-anchor has important applications in boat navigation, marine fishing, and water conservancy projects, and plays a key role in ensuring the smooth development of water activities.

I think what you are asking is about the value of the city of the four treasures in the three rivers. However, if you want to know the details, you should consider all the reasons for your feelings.
The three rivers are vast in territory, the mountains and rivers are beautiful in shape, and the products are different. The price of the four treasures produced in the middle cannot be determined immediately. First, we should consider the quality of the four treasures themselves. If the texture is excellent, the quality is high, and the price is naturally high; on the contrary, if the quality is poor and the quality is poor, the price is low.
Second, luck is also about its price. The supply and demand of the world are different, and the price also changes accordingly. If at some time people in the world are competing for the four treasures, and the supply is in short supply, the price will rise; if the supply exceeds the demand, no one will care, and the price will drop.
Furthermore, the land sold is also different. In prosperous cities, everyone is rich and rare, and the price of the four treasures may be high; in remote towns, the people are poor, and few people ask about the price, its value or low.
Furthermore, the person in charge of the treasure also has an influence. If it is rich and wealthy, it may be able to raise the price; if it is an ordinary person, eager to get rid of it, the price may be cheaper.
From this perspective, the market price of the four treasures in Sanchuan is difficult to hide. It is necessary to carefully observe its quality, luck, land sales, and the person in charge of the treasure, and comprehensively consider, before you can get a more accurate price. However, based on the few words asked, it is difficult to determine its exact price.