1 Bromo 4 Fluoro 2 Iodobenzene

In "Tiangong Kaiwu", there are many kinds of alum, and their uses are quite extensive.
The genus of alum has different types and uses. One is bile alum, its main use is related to many fields. In the metallurgical industry, bile alum is often an important raw material for extracting copper. In ancient times, iron is put into the solution of bile alum, and iron can replace copper. This is the principle that "if you get iron, you will turn it into copper". It is an important method for copper refining in ancient times, which greatly promoted the development of the copper industry.
Furthermore, in the printing and dyeing industry, bile alum also plays a key role. It can be a mordant, aid dyes better adhere to fabrics, make dyeing firmer and brighter, improve fabric quality, enrich printing and dyeing patterns, and have a far-reaching impact on the development of textile printing and dyeing.
In addition, in medicine, bile alum also has its uses. However, it needs to be done with caution, because it has certain toxicity. When used in moderation, it can be used as medicine to treat diseases, and has a certain curative effect on some sores, swellings, eye diseases and other diseases. It occupies a place in the field of traditional Chinese medicine.
also has green alum, its main use, and its significant contribution in the field of agriculture. Green alum can improve soil, adjust soil pH, and make soil more suitable for crop growth. Especially for acid soil improvement effect is quite good, can promote the development of crop root system, improve crop yield and quality.
In industry, green alum is also used to make pigments. Such as iron red pigments, which can be prepared, are widely used in painting, ceramics, paint and other industries to provide rich choices for color presentation.
There is also alum, which has many uses. In the field of food processing, alum is often used as an additive. If alum is added when making fritters, it can make the fritters expand and crispy and improve the taste. However, due to health considerations, its use is strictly regulated.
In terms of water purification, alum has an extraordinary effect. The aluminum hydroxide colloid produced by its hydrolysis can absorb suspended impurities in water and make the water clear. It is widely used in ancient times and some simple water treatment to ensure the safety of domestic water.

Mercury is a liquid metal with many unique physical properties. Under its normal state, it is a liquid with a silver-white luster, with a flowing texture and a smooth touch.
The density of mercury is quite high, about 13.6 times that of water, which makes it sink rapidly in water. Because of its high density, if it is accidentally spilled, it is easy to gather into beads and roll and disperse.
The melting point of mercury is extremely low, only -38.87 ° C, and it can be liquid at room temperature; and its boiling point is 356.6 ° C. This boiling point characteristic allows it to remain liquid at room temperature, but it is easy to vaporize when heated. Mercury vapor is toxic and harmful to human body when inhaled.
Mercury has good thermal and electrical conductivity, making it a good conductor of heat and electricity. In many electrical equipment, mercury is often used because of its excellent electrical conductivity.
Mercury has a large surface tension, and it will form nearly spherical droplets on a flat surface, which is not easy to spread. Due to the uneven force on the surface molecules, the force of inward contraction is strong, so that the mercury droplets can maintain a minimum surface area as much as possible.
In rivers, where water converges, it is a liquid fluid. It is fluid and flows from high to low along the topography. It has no fixed shape and varies according to the topography of the river.
The density of water is 1g/cm ³, which is the highest at 4 ° C. The density of water varies with temperature. This property affects water stratification and material distribution.
The boiling point of water is 100 ° C and the melting point is 0 ° C. Under standard atmospheric pressure, when heated to 100 ° C, water boils into water vapor; when cooled to 0 ° C, it condenses into ice.
Water has a large specific heat capacity, absorbs or releases a lot of heat, but its own temperature changes little. This property is of great significance for regulating climate. The climate in coastal areas is relatively mild, because of the large specific heat capacity of seawater.
Water has good solubility, and many substances can be dissolved in water to form an aqueous solution. This property makes water an essential substance for life activities and participates in many chemical reactions and material transportation in living organisms.
The bamboo rat has a rabbit-like body with short and round limbs. Its body is covered with hair, and its coat is mostly gray-brown in color. The hair is soft and fine, and has a warm effect.
The bamboo rat has a solid bone structure that supports its weight and daily activities. Although its limbs are short, they are strong and powerful, and they are good at digging holes. Its forelimbs are flexible, allowing it to dig burrows and grab food.
The teeth of the bamboo rat are sharp and continue to grow. They grind their teeth and often bite hard objects. This habit is related to rodents. Its digestive system is adapted to feed on plants such as bamboo and miscanthus rhizomes. The cecum is developed, which helps digest fibrous food. < Br >
The body temperature of bamboo rats is relatively constant, with a perfect body temperature regulation mechanism, and can adapt to certain temperature changes. However, extreme high temperature or low temperature will still affect their survival and health.

If you want to make the method of "1 + - 4 + - Sichuan - 2 + -
", you should carefully consider the wonders of all skills and ancient methods.
If you want to get one, you should first measure the topography and watch the direction of the water flow. If there is a difference between the height and the bottom, you can dig a canal to lead it, so that the water can flow according to people's wishes. Based on earth and rock, build a weir to beam water, so that it can be slow and moderate. In the meantime, or use a wooden wall as a gate to open and close to save water, so that the state of water can be controlled, and when combined with other things, it can become a suitable trend.
As for the river, it is the greatest of the water flows. The way to make the river is not only to channel, but also to consolidate its two sides. Choose solid stones and huge trees to accumulate on the banks of the river to prevent it from flooding. Or plant deep forests of lush grass, whose roots can fix the soil and prevent the loss of water and soil. Make the river flow smooth, the waves are orderly, and they are complementary to each other. When the water of the river merges into the middle of the river, ponds can be set up to adjust, water can be released during drought, and floods can be stored when flooded, so that the river can be used by me.
And the system of the river is related to storage and protection. Choose good materials, such as the genus of strong wood, and polish them to make their surface smooth. The mortise and tenon joints are connected, so that the structure is strong and seamless. The outside is painted with lacquer, one is waterproof, and the other is to add color. The size of the crate should be determined according to the contents, whether square or round, all of which are practical.
The three are combined, and the crate should be used as the body, and the water of the river should be used. Thin pipes can be set on the side of the crate to attract water, and exquisite mechanisms are built in, so that the water can flow out as needed. If it is necessary for irrigation, the water can flow out of the crate and reach the field through channels. The water of the river is used as the source of living water, constantly replenishing the water, so that the cycle repeats, forming a complete system. Or hide all kinds of utensils in the crate, protecting the risk of the river, and it is difficult for foreign enemies to approach and keep them safe. In short, the method of combining the three requires comprehensive consideration, weighing the pros and cons, and making each do its best to become a delicate tool.

When storing and transporting mercury, rivers, lakes, and tanks, the following matters should be paid attention to:
Mercury is a highly toxic liquid metal, volatile at room temperature, and its vapor is highly toxic. When storing mercury, the first weight should be sealed. It must be stored in a special closed container to prevent mercury vapor from escaping into the air. And the container material should be resistant to mercury corrosion, such as thick-walled glass bottles or metal cans. The storage place should be cool, dry, and well ventilated, away from heat and fire sources, because the temperature will accelerate the evaporation of mercury. At the same time, the storage area should be clearly marked to remind everyone of the danger of mercury.
Rivers and lakes are natural water bodies. When transporting related items, attention should be paid to the protection of water bodies. During transportation, it is strictly forbidden to dump any waste or pollutants into rivers and lakes. If transporting toxic and harmful substances close to rivers and lakes, comprehensive protective measures are required to prevent leakage and pollution of water bodies. For example, transport ships should be inspected regularly to ensure that there is no damage and leakage. If transporting chemical raw materials, etc., emergency treatment equipment must be equipped. In the event of leakage, it can be controlled and treated in time to reduce damage to river and lake ecology.
When tanks are used for storage and transportation, their own condition is crucial. Before use, be sure to check the integrity of the tank in detail to see if there are cracks, holes, etc. The inside of the tank should be thoroughly cleaned to remove residual impurities to avoid chemical reactions with the stored goods. During transportation, the tank should be fixed to prevent it from shaking, collision and damage. And it is necessary to control the transportation temperature, pressure and other conditions according to the characteristics of the transported goods. For example, tanks for transporting flammable and explosive liquids should be equipped with fire and explosion-proof devices, and the driving route should also avoid densely populated areas and fire sources. In short, whether it is mercury, river and lake related transportation, or tank storage and transportation, it is necessary to treat with caution to ensure safety and the environment is not endangered.

The relationship between mercury, rivers, lakes, and swamps and human health is quite profound. Mercury is highly toxic. In the natural environment, if mercury enters rivers and lakes, it will cause water pollution. Mercury is ingested by aquatic organisms and gradually enriched. Such as fish and shrimp, which eat mercury-containing plankton, and mercury accumulates in the body. If people often eat such contaminated fish and shrimp, mercury enters the human body and damages the nervous system. In light cases, they may feel numb and dizzy; in severe cases, they may cause mental confusion, movement disorders, and even life-threatening.
Rivers and lakes are essential to people's livelihood, providing water, moisturizing the land, and nourishing all things. However, if they are polluted, their biological communities will bear the brunt. Poisons accumulate in the bottom mud, aquatic plants and animals may die or migrate, and the ecological balance is broken. The water quality deteriorates, and people and animals suffer from drinking it, causing various diseases, such as gastrointestinal diseases and skin diseases, all caused by sewage.
The marsh, although small in area, is of great ecological significance. Microorganisms in it are active and participate in material circulation. However, the marsh is polluted, the microbial community is unbalanced, and harmful gases such as methane escape, which not only affects the atmospheric environment, but also causes local climate anomalies. People are in the middle of it, breathing turbid gas, which is also harmful to health.
And water pollution affects the surrounding soil. Water seeps into the ground, sewage and groundwater systems, making drinking water sources scarce. In the long run, the fertility of the land decreases, the yield of crops decreases, and the food is also harmful to the human body. Therefore, protecting the clearness of rivers, lakes and marshes and preventing the pollution of mercury toxins is an important matter related to the health of people's livelihood and ecological survival.