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Usually, the TV was single-sided. The screen was only used to display images and play video content on one side, and the back was mainly used to connect various ports and place circuit components. However, with the development of technology, there may be special designs or concepts of double-sided display TV, but this is not the type of TV that is commonly seen in the traditional sense. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

In the three-sided projection system, the two-sided projection had the following relationship: ** 1. Projection relationship between two sides of a point ** 1. ** Projection line is vertical to the projection axis ** - If the frontal projection of space point A is a 'and the horizontal projection is a, then a' a OX axis; if the side projection is a ", then a 'a" OZ axis. - For the projection of a point on a projection plane, such as the H projection b and the V projection b 'of a known space point B, the two projection lines of the point must be vertical to the corresponding projection axis. Moreover, according to the projection law of a point, such as aax = a "az, the projection line of the two sides of the point must be vertical to the corresponding projection axis, which is helpful to determine part of the spatial position information of the point through the two projections.(Because the two coordinates cannot completely determine the location of the spatial point, in the case that the engineering drawing standard of our country uses the first angle-splitting drawing method, the V-projection and H-projection of the point can reflect part of the coordinate (x,y,z) of the spatial point A.) 2. ** Coordinates reflect location relationships ** - The frontal projection of a point (V projection), with coordinates (x,z), reflects the left, right, up, down position of the point; the horizontal projection (H projection), with coordinates (x,y), reflects the left, right, up, down position of the point. 3. ** Internal connection and shared projection axis ** - In the three-sided projection system, any two projections had an internal connection, and they shared a projection axis. For example, when two projections of a point are known, the third projection can be found according to these relationships. ** 2. Projection relationship between two sides of an object (from a three-dimensional perspective)** 1. ** Location Relationship ** - If the front view was viewed as a projection from one direction and the top view was viewed as another direction (the front view and the top view could be viewed as two-sided projections), then the top view would be below the front view. 2. ** Direction relationship ** - The main view could show the left, right, up, and down directions, while the top view could show the left, right, front, and back directions. 3. ** size relationship (the third-class law reflects the two-sided projection relationship)** - There were certain rules in some size relationships. For example, when analyzing the projection of an object, there was a relationship between the two projections in terms of length, width, height, and other size. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Double-sided embroidery was also known as double-sided embroidery. It was one of China's outstanding traditional crafts. It was mostly reflected in the works of China's four famous embroidery (Xiang embroidery, Su embroidery, Yue embroidery, and Shu embroidery). It had a long history and had existed as early as the Tang Dynasty. In the Qing Dynasty, double-sided embroidery with good craftsmanship and excellent embroidery skills appeared. However, there were not many of them at that time, and there were even fewer technical and artistic works. After 1949, double-sided embroidery had more innovative developments. For example, Su embroidery created double-sided embroidery, double-sided foreign object embroidery, double-sided three-different embroidery, and completely different double-sided embroidery. Its artistic expression was pushed to a new height. In 2006, double-sided embroidery was included in the first batch of national intangible cultural heritage protection list. Double-sided embroidery could be classified into square outer and circular inner structure, table screen structure, circular structure, and egg-shaped structure according to the frame; according to the size, it could be divided into 30-circle diameter, 20-circle diameter, size-multiplied, and square. The unique feature of this technique was that on the same base material, the front and back images were embroidered in the same embroidery process. The outlines were exactly the same, and the patterns were equally exquisite, just like sculptures. For example, the double-sided three-color embroidery in Su embroidery could allow two people to sit opposite each other and embroider two different patterns, different stitches, and different colors on the same piece of embroidery. There was also double-sided different-color embroidery, which could embroider two identical patterns but different colors on the same piece of cloth with the same stitches. "Palace Wall Flower Shadow: The Legendary Life of the Mute Embroidery Girl" was equally exciting. Everyone was welcome to click and read it!

The English word for " multi-faced mirror " was " multi-faced Reflector'. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The processing of printed circuit boards is a more complicated process. The following is the content of the single-sided and double-sided printed circuit boards: ** 1. The process of copying a printed circuit board ** 1. ** Preparing Work ** - For a single-sided and double-sided printed circuit board, the original circuit board must first be analyzed. Confirm the type of circuit board (single-sided or double-sided), the number of layers, and other basic information. - Prepare a board removal tool to remove the electronic components on the printed circuit board. 2. ** Removing components and recording information ** - Carefully remove the electronic components on the original printed circuit board. During the removal process, record the detailed location, model number, and other information of the components to form a bill of materials. This step was very important for the subsequent component purchases and the accurate restoration of the circuit board. 3. ** Empty board processing ** - The empty board after the components were removed was scanned. For single-sided and double-sided PCs, it was scanned into a picture and then processed by the copying software to restore it to a printed circuit board drawing file. A single-sided printed circuit board was relatively simple, and its circuit layout was only on one side, while a double-sided printed circuit board needed to accurately handle the circuit connection relationship on both sides. 4. ** Processing and making of printed circuit boards ** - Check and modify the restored printed circuit board file according to the actual needs (if necessary), and then send the printed circuit board file to the processing plant. - In the process of making a board, for a single-sided printed circuit board, it mainly involves cutting the appropriate board, drilling (if necessary), and performing the necessary plating and engraving to form the circuit pattern. In addition to these basic steps, the double-sided circuit also needs to pay special attention to the connection of the two-sided circuit, such as the correct transmission of signals through the via. 5. ** Purchasing of components and preparation for welding ** - Purchasing the required components according to the previously recorded BOMs and ensuring that they have the required technical indicators and quality certification. - Prepare the welding materials, such as welding paste, pads, etc., and ensure that the surface of the printed circuit board is clean, flat, free of impurities and defects. For double-sided printed circuit boards, check the state of both sides. 6. ** Welding Technique ** - ** Single-sided printed circuit board welding **: Solder the purchased electronic components to the single-sided printed circuit board according to the recorded positions. During welding, pay attention to the connection quality between the pins and the pads of the components to ensure the fullness of the welding. The welding spots must have an appropriate size and shape to ensure sufficient contact with the pins and pads of the components. At the same time, the amount of tin paste must be controlled to avoid problems such as insufficient welding or short circuit caused by too much. - ** Double-sided printed circuit board welding **: The welding of double-sided printed circuit boards is relatively complicated. First, the components on one side were to be bonded. When this side was bonded, care must be taken to avoid affecting the circuit on the other side. After the welding and inspection of one side was completed, the other side should be welding. The relevant requirements for the quality of the welding should also be followed, and the installation and welding of the components on both sides should meet the design requirements to ensure the normal electrical performance. 7. ** Testing and Testing ** - After the welding was completed, the single-sided and double-sided printed circuit board was tested and debugged to check whether it achieved the expected function, including electrical performance tests (such as insulation resistance test, current and voltage test, etc.) and functional tests to ensure that there were no short-circuits, open circuits, etc., and the components were working normally. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

He recommended the book," Siheyuan: Uncle Yi Zhonghai, Instantly Flatten!" The protagonist of the novel, Endless Heavens, written by the Dragon Knight in the Snow, traveled to the Love Courtyard. His uncle was Yi Zhonghai, and he was lying flat. " I, King Kong with One Punch, Beat Godzilla Up " was not bad either. It was a work by a cat, and it was a work of the infinite universe. The main character, the handsome boy from the Skeleton Island, was fearless in the face of all kinds of powerful existences. There was also 'I Live Forever in the World of Cultivators' which was a Xianxia novel. The protagonist, Zhou Yi, brought the fruit of immortality through the prison and cultivated. However, the protagonist was infatuated with the Spring Breeze Building and was a little frivolous. His description of the imperial court was childish and his psychological description was too much like water. His writing style also needed improvement. " Family Cultivation: Little Turtle Bestows on Me to Live Forever " was a Xianxia novel written by C Hongyu. The family style was more like a group. Chen Qingxuan contracted Longevity Turtle to live forever and cultivated with Little Turtle in the family. " Eagle of Byzantine: Theoelos of Macedon ". It was a historical novel written by I Have No Head. The story of the male protagonist Theoelos in the Byzantine Empire had a medieval flavor. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The Four Sacred Beasts were also known as the Four Spirits and Four Symbols, namely the Azure Dragon, White Tiger, Vermillion Bird, and Black Tortoise. In ancient China myths and legends, they were closely related to positions, constellations, and elements. In terms of orientation, the green dragon is the guardian beast of the east, the white tiger is the guardian beast of the west, the vermilion bird is the guardian beast of the south, and the black tortoise is the guardian beast of the north. From the perspective of the stars, the eastern horn, yuan, di, fang, xin, wei, ji are the green dragon, kui, lou, wei, mao, bi, yu, shen are the white tiger of the west, jing, gui, liu, xing, zhang, yi, zhen are the vermilion bird of the south, and dou, niu, nu, xu, wei, shi, bi are the black tortoise of the north. In terms of elements, they represented the four elements of metal, wood, water, and fire. The green dragon was wood, the white tiger was metal, the vermilion bird was fire, and the black tortoise was water. In ancient culture, the four sacred beasts had the functions of dispelling evil, avoiding disasters, and praying for blessings. There was a saying in Taoism that they were the guardians of the gods. At the same time, the Four Sacred Beasts also appeared in many modern derivative works, such as being made into wooden mechas or becoming active elements in games (such as the Rock Kingdom). "Warrior Sage!" The novel is equally exciting. Everyone is welcome to click and read it!

I recommend Immortal Martial Great Tang: Starting from the Rich Woman, the author won't give up. It was about Chen Yanjun transmigrating to the Seventh Academy of the Imperial College of the Tang Empire. He was average in talent, weak and sickly, but handsome. He was supported by a beautiful woman to study and cultivate. He was regarded as a gigolo by his classmates. He had both children in his early twenties. Although he had a cheat, he was still confused. There were also many other roles, such as the female lead, Cui Yourong. " I can calculate the probability of an event ", a Xianxia novel written by Yin567. Lin Shou woke up under the bridge. He could calculate the probability of things happening, and the probability changed with time. "Longevity Mourning and Chaos Tie," is a reclusive creation. After Zhou Chu's Hidden Latch of Life and Death was broken, his soul and body were separated. He alternated between human society and nature. After transmigrating, he found that the world was also "sick" and had many unique settings. Pretending to be Supreme in the Heavens, written by the Doomsday War God. The male protagonist Faur was tricked into transmigrating and became a special master, but he was afraid that he would be discovered to be pretending. "Super Grade Mind Skill," the work of the four. Shi Lei was an orphan who was unmarried. After he obtained his Mind Connection, his life turned upside down. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

I recommend a few novels to you. " Who Knows Blind Selection Better Than Me " was a fantasy martial arts novel written by Drunk Desolation. The male lead, Dong Qing, had many identities. In the story, he was rewarded after being blindly selected to become the Ninth Elder's disciple. He also had Deep Blue, who would help him add points. The various character settings were novel. " Since I've fallen in love with you, I won't let go " was a romantic youth novel about who else could I love other than you. The love and hate between the male and female protagonists were intertwined, and the heirs of the four major corporations were entangled because of the change in the fate of the female protagonist. " My Girlfriend Is Deadly " was a light novel that was written seriously. The male protagonist had the ability to recall death, and there were many female protagonists who were sickly. It was similar to the setting of " Life in a foreign world from scratch." The writing was not bad, and the plot was novel and funny, but it had been cut off. " The Six Palaces " was an ancient romance novel written by Yue Lanxiang. It was a dark novel. The female protagonist was not afraid of family strife. The author's writing style was good but not famous. " Qing Yuan " was an ancient romance novel. The female protagonist's life changed after a dream. The story was empty. The male protagonist was a little bad, but the writing was good enough to make the readers love and hate him. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>