The following are the main basis and conditions for evaluating the price of jadeite. If it is not, it cannot be called a special grade. First, worth hundreds of millions: Price: 120 million Comments: Old pit glass species emperor green full color bracelet. Glass type with God King Green, it is already a high price, this bracelet is old, the color is full and even, the cotton is less water, and the light is strong. The auction price of 100 million is to find someone who can own it. It not only shows that you have money, but also a symbol of status and identity. The rich are competing for the auction, no wonder the last one can be fired to a price of 100 million! Second, the value of tens of millions: Price: 20 million Comments: Old pit glass full color bracelet. The base is clean, crystal clear, watery, full of fluorescent light, no white cotton and other impurities. The flowers are beautiful, like clouds in the sky. Appreciation of a jade, the general default rules are: origin + species + bottom + color + style 1. Origin: Generally, it is difficult to determine from the photos. The savvy master can see which mining area is produced. 2, species: experts are divided into old pit species, white-green species, flower green species, oil green species, bean species, hibiscus species, gold silk species, etc., this classification has included the water and color of the jade Newcomers are hard to understand. Nowadays, we can usually divide according to glass type > high ice type > ice type > ice type > seed type > bean type. 3, the bottom: experts generally say the species said by the layman, such as glass bottom, ice bottom, etc., but now, we usually say the bottom includes white background, clear water bottom, oil green bottom, blue water bottom, green bottom, bean bottom Wait. 4, color: There are many colors, green, purple, yellow, red, blue, black, etc., there are some multi-color mixture, it is called colorful. 5, the style does not need to say more, you can see it at a glance. Third, worth millions: Price: 3 million Comments: old pit glass species pendant. The carving is exquisite, the distribution of the green belt is very uniform, and there is a mood of the river flowing eastward. The material is thick and complete. Fourth, worth hundreds of thousands: Price: 900,000 Comments: Glass green ring face. The light is strong, the head is good, the color is even, and the head is round and full. The fly in the ointment is that the green is lighter and the size is smaller. Price: 500,000 Comments: Laughing Buddha in the old pit glass. Glass species mainly look at the inside of cotton and impurities. The color of this Buddha is clean, no impurities, strong fluorescent, full and round, and the head is very full. Price: 180,000 Comments: Glass of melon, crystal clear, full shape, full of water. Five, tens of thousands of pieces: Price: 120,000 Comments: high ice species Qingshui Guanyin, the old color is well-proportioned, green water is full, it is very intoxicating. Price: 60,000 Comments: blue and green color pendant, the head is good, the material is thin and the color is blue, and the ochre is scattered among them, just like entering the illusion, it is delusional. If the material is thick, the price doubles. Price: 38,000 Comments: Ice flower pendant on white. The head is good, the cotton is more, there is no impurity, and the carving is general. Sixth, worth thousands of pieces: Price: 7 thousand-9 thousand Comments: 糯 kind of wishful, water feet with light green, simple and elegant carving. Price: 3,000 - 5 thousand Comments: 糯 ice kind of safety buckle. No cracks, less material, good head. Seven, worth hundreds of pieces: Price: 1000 yuan Comments: 糯 貔貅 貔貅, with a little purple, the size is slightly smaller, the water is generally, the variegated meat is not delicate. Price: 700 yuan Comments: 糯 ice species gourd. The size is small, slightly thin, and there is more variegated color (yellow background) cotton. Price: 500 yuan up and down. Eight, dozens of pieces: Price: about 100 yuan Comments: Everyone has a misunderstanding about jade: I think that a few hundred or so are not A goods. In fact, A goods only indicate the natural attributes of jade, and it does not mean that its price is necessarily expensive. This is like a beautiful woman, A goods indicate that she is not cosmetic, but sometimes it is not as popular as a cosmetic beauty. These jade pendants, water and carving work are very poor, dozens of pieces can be won, is common in tourist areas. How do masks play a protective role? Medical masks,Disposable medical mask,Mask medical,Disposable mask medical Shenzhen Comfity Technology Co.,Ltd , https://www.comfitymemoryfoam.com
The mask must have at least three layers to work.
The most common medical surgical mask is a rectangular mask, which does not fit closely with the face. All masks are divided into three layers, namely outer layer, middle layer, and inner layer, the outer layer has a waterproof effect; the middle layer has
Filtration, 90% of particles larger than 5 microns can be blocked; the inner layer is used to absorb moisture. The main difference between protective masks and medical surgical masks is the intermediate adsorption layer.
When the saliva droplets in the mouth are splashed outward, the outermost layer of the mask can play a certain blocking role, and bacteria and viruses in the air can be adsorbed in the middle layer, which plays an effective filtering role to ensure
We breathe clean air.
How long does the mask need to be replaced?
The study found that the N95 mask was worn for 2 days, the filtering effect remained above 95%, and the respiratory resistance did not change much; the filtering effect was reduced to 94.7% after wearing for 3 days.
Can wearing multiple masks better prevent new coronavirus infections?
As far as medical masks are concerned, any qualified product that is properly worn requires only one to achieve the desired protective effect. The higher the level of protection effect, the greater the breathing resistance of the mask. When we wear
The feeling of experience will be a little bit worse, and the sense of comfort will also be reduced. When people wear a mask and breathe in, the mask will have a certain resistance to the flow of air. When the breathing resistance is too large, people will feel dizzy,
Chest tightness and other discomforts. If you wear an improper mask, not only will it make you breathless, but the air cannot enter the nasal cavity from the front, but only from the side, but it will not play a preventive role.
Therefore, as long as it is a qualified product, medical protective masks and general medical surgical masks can effectively prevent new coronavirus infections, that is, prevent the spread of pathogens carried by respiratory droplets.