Poetry is a lyrical literary genre. According to different classification standards, it can be divided into many categories. It has the following four characteristics: (1) Poetry content is the most concentrated reflection of social life. (2) Poetry is full of emotion and imagination. (3) The poetic language is characterized by conciseness, image, harmonious tone and distinct rhythm. (4) The form of poetry: it is not based on sentences, but on behavior, and its branches are mainly based on rhythm, not on meaning.
First, the classification of ancient poetry:
1, classified by temperament:
It can be divided into two categories: ancient poetry and modern poetry. Classical poetry and modern poetry are concepts formed in the Tang Dynasty, which are divided from the perspective of poetic rhythm.
2, according to the content classification:
It can be divided into narrative poems, lyric poems, farewell poems, frontier poems, pastoral poems, nostalgic poems (epics), object-chanting poems, mourning poems and allegorical poems.
Second, the classification of new poetry:
1. Narrative poetry and lyric poetry: this is divided according to the expression of the content of the work.
2. Metric poetry, free verse, prose poetry and rhyme poetry: this is classified according to the phonological rhythm and structural form of the language of the work.
What are the types of concrete? In engineering design and construction, the word "concrete" is often abbreviated as "concrete".
Definition of concrete:
Engineering materials made of cement, aggregate and water by mixing, molding and curing.
Concrete type:
According to different cementing materials, it can be divided into cement concrete, asphalt concrete, gypsum concrete and polymer concrete.
According to the apparent density, it can be divided into heavy concrete, ordinary concrete and light concrete.
According to different functions, it can be divided into structural concrete, road concrete, hydraulic concrete, heat-resistant concrete, acid-resistant concrete and radiation-resistant concrete.
According to the different construction technology, it can be divided into shotcrete, pumping concrete and vibration grouting concrete.
The classification of concrete can also be divided according to the strength grade of concrete.
What are the common species of turtles?
Brazilian red-eared turtle is one of the subspecies of Eupatorium adenophorum, which is a semi-aquatic turtle. Because it has two thick red stripes on both sides of the back of the head, it is also called red-eared turtle, which is an excellent species among turtles. Native to America, it has high edible, medicinal and ornamental values and is very suitable for artificial breeding.
Tortoise bite
Crocodile turtle is the oldest living reptile and one of the largest freshwater turtles in the world, and is known as the king of freshwater animals. Divided into two categories, commonly known as crocodiles and crocodiles. Crocodiles are also called real snapping turtles (produced in North America and the southeastern United States), and small crocodiles are also called snapping turtles. There are four subspecies, namely North America, Florida, South America and Central America. Common ones are North America and Florida, among which Florida is more expensive for some artificial reasons. Because of its large size and strong aggression, there are few natural enemies except alligators. It once lost its habitat because of human hunting and was listed as a vulnerable species by the World Conservation Union. Because of its high ornamental value and strong adaptability, it is favored by domestic turtle lovers.
Chinese grass turtle
Trionyx sinensis is one of the most widely distributed and numerous turtles in China. The whole body is a treasure, which is regarded as the top grade of food tonic and medicine tonic in Shennong Herbal Classic and Compendium of Materia Medica. China has always regarded it as a symbol of health and longevity. China grass turtle is very popular in the international market. People in Japan, the Philippines, Europe and America regard it as a symbol of "good luck and long life".
Maurice Mutika
Mauremys mutica is a reptile belonging to the genus Tetranychus, which is distributed in Vietnam, Japan, Taiwan Province Island, eastern and southern Chinese mainland, Hainan and western Yunnan. It is common in mountain basins or river valleys in hilly areas, and is often found in small shrubs or grasses nearby.
There are three types of RNA, namely, tRNA (transport RNA), rRNA (ribosomal RNA) and mrna (messenger RNA). MRNA is the template for synthesizing protein, and its content is transcribed according to the DNA in the nucleus. TRNA is the recognizer of base sequence (i.e. genetic codon) on mRNA and the transporter of amino acids. RRNA is a component of ribosomes, and it is the workplace of protein synthesis.
What are the types of bridges? By material:
Wooden bridge, stone bridge, brick bridge, concrete bridge and reinforced concrete bridge
According to appearance:
Beam bridge arch bridge cable-stayed bridge suspension bridge viaduct combined system bridge
According to the purpose:
Railway bridge, highway bridge, pipeline bridge, multifunctional bridge (overpass belongs to highway bridge)
By crossing objects:
Bridges across rivers, valleys, railways or highways, and viaducts (also called trestles) across urban areas, industrial areas or crop areas.
Depending on whether the bridge can be moved:
Fixed bridge, open bridge and pontoon bridge
According to the total length or span of the bridge can be divided into:
Da Qiao bridge bridge bridge bridge.
Bridges in China have gone through four stages of development. The first stage is mainly in the Western Zhou Dynasty and the Spring and Autumn Period, including the previous historical era, which is the founding period of the ancient bridge. At this time, in addition to the original wooden bridge and Tingbu bridge, there are mainly two forms of bridge: beam bridge and pontoon bridge. At that time, due to the backward level of productivity, most of them could only be built in areas with flat terrain, narrow rivers and gentle water flow, and bridges could only be wooden beams, so the technical problems were relatively easy to solve. On the other hand, pontoons are often used in rivers with wide water surface and fast flowing water. & ltBR & gt The second stage is dominated by Qin and Han Dynasties, including the Warring States and the Three Kingdoms, which is the period of the establishment and development of the ancient bridge. The Qin and Han Dynasties were a brilliant development stage in the history of Chinese architecture. At this time, not only the bricks of artificial building materials were invented, but also the arch coupon structure with the theme of masonry structure system was created, which created the prerequisite for the emergence of arch bridges later. The appearance of ironware in the Warring States period also promoted the multi-faceted utilization of stone materials in buildings, thus adding new components such as stone pillars, Liang Shi and stone bridge surfaces to the log beam bridge. Not only that, but also its great significance lies in the stone arch bridge came into being. The establishment of stone arch bridge has played an epoch-making role in the history of ancient bridge construction in China, which is not only practical, but also economical and beautiful. The great development of Liang Shi stone arch bridge not only reduces the maintenance cost and prolongs the service life of the bridge, but also improves the scientific level of structural theory and construction technology. Therefore, the use of building stone and the emergence of arch coupon technology in Qin and Han dynasties are actually a major revolution in the history of bridge construction. Therefore, according to some documents and archaeological data, about the Eastern Han Dynasty, four basic bridge types, namely, beam bridge, pontoon bridge, cable bridge and arch bridge, were formed. The third stage of & ltBR & gt is dominated by the Tang and Song Dynasties, including the Jin, Southern and Northern Dynasties and the Sui, Tang and Five Dynasties, which is the heyday of the development of the ancient bridge. Compared with Qin and Han Dynasties, Sui and Tang Dynasties had stronger national strength, and Tang and Song Dynasties achieved long-term stability and unity. The level of industry and commerce, transportation and science and technology was very developed, and it was the most advanced country in the world at that time. After the Eastern Jin Dynasty, because a large number of Han aristocrats moved south, the economic center moved from the Yellow River basin to the Yangtze River basin, which led to the great development of the economy and technology in the southeast water network area, and then led to the great development of the bridge. Therefore, many bridges that have attracted worldwide attention came into being at this time, such as Zhao Zhouqiao, the open-shouldered stone arch bridge initiated by Li Chun, a stonemason in Sui Dynasty, Hongqiao, the stoplog wooden arch bridge invented by abandoned soldiers in Northern Song Dynasty, Wan 'an Bridge in Quanzhou, built by reciting, Xiangzi Bridge in Chaozhou, Guangdong Province, Liang Shi Bridge in Southern Song Dynasty and the combination of opening and closing pontoons. These bridges are very famous in the history of bridges in the world, especially in Zhao Zhouqiao. Seven centuries later, similar bridges appeared in other countries in the world. Throughout the history of Chinese bridges, almost all major inventions and achievements, as well as bridges that can compete for the first place in the world, were established at this time. The fourth stage of & ltBR & gt is the Yuan Dynasty, the Ming Dynasty and the Qing Dynasty, which is the saturated period of bridge development, and there are almost no major innovations and technological breakthroughs. At this time, the main achievement is to repair and transform some ancient bridges, leaving many construction documents for bridge construction, providing a lot of written materials for future generations. In addition, some arduous projects, such as Wannian Bridge in Cheng Nan, Jiangxi and Panjiang Bridge in Guizhou, were completed. At the same time, Sichuan, Yunnan and other places have built many cable bridges, and the construction technology of cable bridges has also improved. In the late Qing Dynasty, that is, 188 1 year, with the opening of the first railway in China, another technological revolution in the history of Chinese bridges was ushered in. & ltBR & gt& ltBR & gt Bridges can be divided into wooden bridges, stone bridges, brick bridges, bamboo bridges, rattan bridges, iron bridges, salt bridges and ice bridges according to the main materials of bridge construction. & ltBR & gt wooden bridge is the earliest form of bridge, and almost all bridges before Qin and Han Dynasties in China were wooden bridges. Such as the earliest wooden bridge and wooden column beam bridge. Boat bridges appeared around Shang and Zhou Dynasties, and row-column wooden beam bridges and outboard wooden beam bridges appeared around Warring States Period. However, due to the characteristics of wood itself, such as looseness, perishable, and dominated by the strength and length of materials, it is not only difficult to build bridges on rivers with wide rivers, but also difficult to build durable bridges. So in the Northern and Southern Dynasties, it was replaced by a bridge with mixed wood and stone. & ltBR & gt Stone bridge and brick bridge. Generally speaking, the bridge deck structure is also a bridge made of stone or brick, but bridges made of pure brick are rare, usually made of brick, wood or masonry, and stone bridges are more common. During the Spring and Autumn Period and the Warring States Period, a wooden bridge with stone piers appeared, and the Western Han Dynasty further developed into a Liang Shi bridge with stone pillars, and a single-span stone arch bridge appeared in the Eastern Han Dynasty. In the Sui Dynasty, the world's first single-hole arc stone arch bridge with shoulder was born, while in the Tang Dynasty, Li Zhaode created a porous Liang Shi bridge. The Song Dynasty witnessed the vigorous development of large stone bridges, creating Liang Shi Bridge which spans several miles at the intersection of rivers and seas, such as Luoyang Bridge and Ping 'an Bridge in Quanzhou, and large stone arch bridges, such as Lugou Bridge in Beijing and baodai bridge in Suzhou. & ltBR & gt Bamboo Bridge and Rattan Bridge. Mainly distributed in the south, especially in the southwest. Generally, it is only used on rivers with narrow river surface, or as a temporary crossing. In the early days, it was mainly a cable bridge. In the Northern and Southern Dynasties, the bamboo cable-stayed bridge was called "Ruxiang Bridge". Later, bamboo cable bridge, bamboo pontoon bridge and bamboo slab bridge appeared. In ancient times, iron bridges included iron cable bridges and iron column bridges. The former belongs to the category of cable bridge, which is relatively common and appeared in the Tang Dynasty. The latter is a kind of beam bridge, which is actually a wood-iron mixed bridge, which is relatively rare. Jiangxi has seen an example. & ltBR & gt Salt Bridge and Ice Bridge. Mainly exists in special natural environment. The former is mainly found in salt lake area of Qinghai, while the latter is mainly found in cold areas in the north. & ltBR & gt According to the structure and appearance of bridges, there are four basic types: beam bridge, pontoon bridge, cable bridge and arch bridge. & ltBR & gt beam bridge, also known as flat bridge and span bridge, is a bridge supported by piers at a horizontal distance, and then beams are erected to pave the deck. This is the most widely used bridge, which appeared earlier than other bridges in history. It takes the form of wood, stone or a mixture of wood and stone. In the pre-Qin period, all beam bridges used wooden columns as piers, but this kind of wooden column beam structure showed its weakness very early and could not adapt to the development of the situation. Therefore, it was replaced by the Shizhu wooden beam bridge, such as the multi-span long bridge built in Qin and Han Dynasties: Wei Qiao, Baqiao, etc. About the Han Dynasty, the pile foundation technology was invented, and stone piers appeared, which showed that bridges made of wood and stones could cross wider rivers and bear the impact of rough waves. However, because the wooden beam on the stone pier is not resistant to wind and rain erosion, a bridge house was built on the bridge to protect the bridge body. This type of bridge (covered bridge) is more common in the south, but it was first seen in the Yellow River basin. Small and medium-sized Liang Shi or stone slab bridge is the most popular bridge type for its convenient structure, durable materials and labor-saving maintenance. Especially after the Southern Song Dynasty, it was very popular in Quanzhou, Fujian, and many Liang Shi bridges were created. If there is no pier in the middle of a beam bridge, it is called a single-span beam bridge; If there are piers in the water, so that the bridge body forms two holes, it is called a double-span beam bridge; If there are more than two piers, it is called a multi-span beam bridge. & ltBR & gt The pontoon bridge is also called pontoon bridge, pontoon boat and pontoon truss. Because it is easy to erect, it is often used in the military, so it is also called "Zhanqiao"-a bridge where hundreds of wooden boats (including rafts or bamboo rafts on the water, Lian Heng) are placed side by side on the water with chains, and planks are laid on the boats for people to pass. If the bridge in the strict sense is marked by crossing the air and having column piers, it is not a bridge in the full sense. The pontoon bridge is mainly built where the river is too wide, too deep or fluctuating, which is beyond the reach of ordinary wooden columns and bridges. Wooden stakes, iron oxen, iron mountains, Shi Zhuan and stone lions are set on both sides of the pontoon bridge, and ropes are used. Tianjin Bridge was built in Luoshui, Luoyang in the first year of Sui Dynasty. It was the first pontoon bridge connecting ships with chains. At present, pontoon bridges are still widely used in southern China, such as Jiangxi, Zhejiang and Guangxi. & ltBR & gt cable bridge is also called suspension bridge, cable bridge and suspension bridge. , is a bridge suspended with bamboo cables or rattan cables and iron cables as the backbone. Most of them are built on steep river banks and dangerous valleys, and the current is too fast to be used as docks, mainly in the southwest of China. Its practice is to build houses on both sides of the river, set up posts for tying ropes and rotating posts for twisting ropes respectively, then tie several thick ropes flat, and then put boards horizontally on the ropes, and some even add one or two ropes on both sides as handrails. It was first seen in Qin and Han Dynasties. For example, Qin built a bamboo cable bridge in the southwest of Yizhou (now Chengdu) in Sichuan, also called Yili Bridge. The existing famous ones are Luding Iron Cable Bridge and guanxian Bamboo Cable Bridge built in Ming and Qing Dynasties. Crossing the cable bridge feels very thrilling, just as the ancients described the cable bridge: "People are hanging in the air, and if they don't quit in an instant, they will fall into a bottomless valley." Monk Zhimeng in the Tang Dynasty said, "If you can't see the end, the shadows are fighting." In fact, it is still safe to really cross the past, just like Xu Xiake's Travels commented on the Panjiang Bridge in Guizhou: "Look at it and you will stop." & ltBR & gt arch bridge appeared late in the history of Chinese bridges, but once the arch bridge structure was adopted, it developed rapidly and became the most vital bridge type in ancient times. Even today, it still has broad prospects for further development. Arch bridges are divided into stone arch bridges, brick arch bridges and wooden arch bridges, among which brick arch bridges are rare and only occasionally used in temples or gardens. Stone arch bridges are commonly used and can be divided into single arch, double arch and multi-arch. The number of arches depends on the width of the river. Generally, the arch in the middle is particularly high, and the arches on both sides are slightly smaller. According to the shape of the arch, there are pentagons, semicircles, pointed arches and flat arches. The bridge deck is generally paved with stone slabs, and the side of the bridge is paved with stone railings. The image of the arch bridge was first seen in the portrait bricks in the Eastern Han Dynasty. It was produced by the shape of the wooden and Liang Shi bridge with outriggers, and was influenced by the shape of the tomb arch and water pipes. Documentary records can be found in Zhu in the Southern and Northern Dynasties. The earliest existing physical object is the Zhao Zhouqiao designed and built by Li Chun in Sui Dynasty. After the Ming dynasty, especially in the Qing dynasty, stone arch bridges issued whole coupons, that is, "bucket coupons." & ltBR & gt In addition, other special shapes include Feiting plank road, access bridge, fiber bridge, curved bridge, fish pond flying beam and Feng Shui bridge. & ltBR & gt "Flying Pavilion", also known as Pavilion Road and Courtyard Road, is an overpass. The crossing passage between ancient palaces and pavilions. "Three Auxiliary Huang Tu": "It is in the west of the palace (referring to the central palace at the end of the Han Dynasty), and the flying pavilion is connected with Zhang Jian Palace, and the road is built up and down." During the Qin and Han dynasties, the main halls of the palace were connected by pavilions and roads. Because there was a way up and down, it was called the complex road. Qin Shihuang built a pavilion road from Epang Palace to Lishan, on the footbridge and under the vehicle bridge, which was the earliest overpass in China. "plank road", also known as stack pavilion, bridge pavilion and single-arm wooden beam bridge. A road paved with wooden frames in steep places in mountainous areas. & ltBR & gt "Canal Bridge" is not only a water diversion channel, but also a bridge for pedestrians. That is to build a canal on the bridge to divert water. For example, Huiyuan Bridge in Hongdong County, Shanxi Province was built in the Jin Dynasty. Therefore, there is still slang for "water bridge, there is water on the bridge" in Shanxi today. "Fibre Channel Bridge" is a long ribbon bridge parallel to the river, which is built for the convenience of fiber drawing. More common in Zhejiang Canal area. Some are as long as one or two kilometers, or even five or six kilometers. For example, there is a "100-hole Guantang" optical fiber bridge in Ruanshe, Shaoxing, which was built during the Tongzhi period of the Qing Dynasty. The bridge is more than 380 meters long with a span of165,438+05. The bridge deck consists of three stones, with the bottom level with the water surface. & ltBR & gt "Curved Bridge" is a unique bridge type in gardens, so it is also called Garden Bridge. Bridges, trails and corridors are all channels for tourists to enjoy the scenery in the garden. "The scenery is more beautiful than the curve", so the bridges in the garden are mostly made into corners, such as the zigzag bridge, forming a broken line that swings back and forth and looks around, so as to extend the landscape and expand the landscape picture. Curved bridges are generally composed of stone slabs and railings. The slate is slightly higher than the water surface, and the railing is lower, which makes it look inseparable from the water surface and separated from the space, especially with endless implications.
What are the types of hiphop? Generally speaking, there are 65,438+00 old schools (street dance types 85 years ago, which are still very popular today), Poppin' (mechanical dance) Lockin' (lock dance) Breakin' (skill dance), a new school (street dance types emerging after 85 years, based on the old schools, are very avant-garde according to the current music. New style (comprehensive dance) HipHop House (mainly with brisk pace) Krump (fighting dance) New Jazz (sexy and handsome fashion) Reggae (cheerful and sexy charm)
What kinds of books are there? A Marxism, Leninism, * * Thought 1 Marx and Engels Works 2 Lenin Works 3 Stalin Works 4 *** Works 5 Marx, Engels, Lenin, Stalin, * * Works Compilation 7 Life and Biography of Marx, Engels, Lenin and Stalin * * * 8 Learning and Research of Marxism–Leninism and * * * Ideas b Philosophy 0 Philosophical Theory 1 World Philosophy 2 China Philosophy 3 Asian Philosophy 4 African Philosophy 5 European Philosophy 6 Oceania Philosophy 7 American Philosophy 80 Logic Science (General) 8 1 Logic 82 Ethics 83 Aesthetics 84 Psychology 9 Atheism, Religion C Introduction to Social Science 0 Theory and Methodology of Social Science 1 Status and Overview of Social Science 2 Organs, Organization and Meeting 3 Social Science Research Methods 4 Social Science Education and Popularization 5 Social Science Series, Anthology and Continuous Publications 6 Social Science Reference Books [7] Social Science Literature Retrieval Reference Books 8 Statistics 9 1 Sociology 92 Demography 93 Management [94] System Theory (Systematics, Systems Engineering) 96 Talents Study D Political Science, Law 0 Political Theory1/3 * * Production Movement * * 4 Workers, Peasants, Youth, Women's Movements and Organizations 5/7 World Politics 8 Diplomacy, International Relations 9 Law E Military 0 Military Theory 1 World Military 2 China Military 3/7 National Military 8 Strategy, Campaign, Tactics 9 Military Technology 99 Military Topography, Military Geography F Economy 0 Political Economy 1 World Economic Overview, Economic History, Economic geography 2 economic planning and management 3 agricultural economy 4 industrial economy 5 transportation economy 6 post and telecommunications economy 7 trade economy 8 finance, finance g culture, science, education and sports 0 cultural theory 1 overview of world cultural undertakings 2 information and knowledge dissemination 3 science, scientific research 4 education 8 sports h language, literature 0 linguistics 1 Chinese 2 China minority languages 3 commonly used foreign languages 4 Sino-Tibetan 5 Altai 7 Indo-European I literature 0 literature theory 1 world literature 2 China literature 3/ 7 literature J art 0 art theory 1 world art overview 2 painting 3 sculpture 4 photography 5 arts and crafts 6 music 7 dance 8 drama 9 film and television art K history, geography 0 history theory, 1 world history, 2 China history, 3 History of Asia 4 History of Africa 5 History of Europe 6 History of Oceania 7 History of America 8 1 Biography 85 Literature and Archaeology 89 Customs 9 Geography n General Theory of Natural Science O Mathematical Chemistry 1 Mathematics 3 Mechanics 4 Physics 6 Chemistry 7 Crystallography p Astronomy, Geography 1 Astronomy 2 Surveying and Mapping 3 Geophysics 4 Meteorology 5 Geology 7 Oceanography 9 Physical Geography q Bioscience 1 General Biology 2 Cytology 3 Genetics 4 Physiology 5 Biochemistry 6 Biophysics 7 Molecular Biology 8 1 Bioengineering 9 1 Paleontology 93 Microbiology 94 Botany 95 Zoology 96 Entomology 98 Anthropology R Medicine, Health 1 Preventive Medicine, Hygiene 2 Traditional Chinese Medicine 3 Basic Medicine 4 Clinical Medicine 5 Internal Medicine 6 Surgery 8 Special Medicine 9 Pharmaceutical S Agricultural Science/ Kloc-0/ Agricultural Basic Science 2 Agricultural Engineering 3 Agronomy (Agronomy) 4 Plant Protection 5 Crops 6 Gardening 7 Forestry 8 Animal Husbandry, Veterinary, Hunting, Silkworm, Bee 9 Aquatic Products, Fishery T Industrial Technology TB General Industrial Technology TD Mining Engineering TE Oil and Gas Industry TF Metallurgical Industry TG Metallography, Metal Technology TH Machinery, Instrument Industry TJ Weapon Industry TK Power Engineering TL Atomic Energy Technology TM Electrical Technology TN Radio Electronics, Telecommunications technology TP automation technology, computing technology TQ chemical industry TS light industry, handicraft industry TU building science TV water conservancy project U transportation 1 comprehensive transportation 2 railway transportation 4 road transportation 6 waterway transportation [8] air transportation V aviation, aerospace 1 research and exploration of aviation and aerospace technology 2 aviation 4 aerospace (aerospace navigation) [7] aviation, aerospace medicine X environmental science, labor protection science (safety 1 basic theory of environmental science 2 environmental protection management 3 environmental comprehensive research 4 disasters and their prevention and control 5 environmental pollution and its prevention and control 7 governance and comprehensive utilization 8 environmental quality evaluation and environmental monitoring 9 comprehensive books of labor protection science (safety science) z 1 series 2 encyclopedias, quasi-books 3 dictionaries 4 anthologies, complete works, anthologies, miscellaneous 5-year periodicals, serial publications 8 book catalogues and encyclopedias.
What kind of packaging paper do you have?
Whiteboard paper, whiteboard, kraft paper, corrugated box, paperboard, tea board, sheepskin, chicken skin paper, paper, paper cup (bag), base paper, coated paper, cellophane, oil-proof and moisture-proof paper, transparent paper, aluminum foil paper, trademark paper, fruit bag paper.
Printing paper:
Coated Paper Newsprint Lightweight Coated Paper Lightweight Offset Paper Writing Paper Bible Paper Book Paper
Industrial paper:
Release paper carbon paper insulating paper filter paper test paper capacitor paper pressure plate paper dust-free paper impregnated paper sandpaper antirust paper
Office and cultural paper:
Tracing paper Other Copy Paper Art Paper Copy Paper Fax Paper Printing Paper Copy Paper Photographic Paper Xuan Paper Thermal Paper Color Inkjet Paper
Household paper:
Toilet paper, facial tissue, napkin, diaper, sanitary towel, wet towel, etc.
Specialty paper:
Decorative base paper, water pattern paper, textured paper, gold and silver cardboard.
What kinds of CDs are there? Your question is very general.
Classify according to the capacity of production process.
I suggest you read multimedia books.