CATDOLL : CATDOLL: Oysters are fed on? Which bolt strength grade has the highest tensile strength?

1. When do oysters eat?

My answer is

The hard areas of the seafloor where oysters live are called oyster beds. These beds are located in deep or shallow seawater or brackish estuary waters. Oysters live in the mid-intertidal zone.

Oysters are fixed shellfish. They usually stay fixed on shallow sea objects or seaside reefs, and eat and breathe by opening and closing their shells. They are filter-feeding organisms, and their main food is tiny zooplankton, diatoms and organic debris.

Oysters vibrate the cilia on their gills to create airflow in the water. Water enters the gills, and the suspended particles in the water are stuck to the mucus. The cilia and tentacles on the gills classify the particles by size. Then the small particles are sent to the mouth, and the large particles are transported to the edge of the mantle and thrown out.

2. Which bolt strength grade has the highest tensile strength?

The highest strength grade of bolts is 12.9. The tensile strength is 1200MPa and the yield strength is 1080MPa. The material is low carbon steel or medium carbon steel after heat treatment.

The strength grade of bolts is divided according to mechanical properties. According to relevant standards, the performance grade of bolts is divided into more than 10 grades, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. Among them, bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched and tempered), which are generally called high-strength bolts, and the rest are generally called ordinary bolts. The bolt performance grade number consists of two parts of numbers, which respectively represent the nominal tensile strength value and yield strength ratio of the bolt material. For example:

Bolts with performance grade 4.6 mean:

1. The nominal tensile strength of the bolt material reaches 400MPa;

2. The yield strength ratio of the bolt material is 0.6;

3. The nominal yield strength of the bolt material reaches 400×0.6=240MPa

After heat treatment, the material of high-strength bolts with performance grade 10.9 can achieve:

1. The nominal tensile strength of the bolt material reaches 1000MPa;

2. The yield strength ratio of the bolt material is 0.9;

3. The nominal yield strength of the bolt material reaches 1000×0.9=900MPa

Bolt: A mechanical part, a cylindrical threaded fastener that is matched with a nut. A type of fastener consisting of a head and a screw (a cylinder with external threads), which must be matched with a nut to fasten and connect two parts with through holes.

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3. What is the highest rock strength grade?

It's level 1.

The hardness of rocks is divided into four levels, namely, extremely strong rocks, hard rocks, medium-strong rocks and weak rocks. Rocks are solid aggregates composed of one or several minerals and natural glass with a stable appearance. Rocks composed of one mineral are called monomineral rocks, and rocks composed of several minerals are called polymineral rocks.

Rocks are classified according to their origin, structure and chemical composition. Most rocks contain silicon dioxide (SiO2), and 74.3% of the Earth's crust is made up of the latter. The silicon content in rocks is one of the important factors that determine the properties of rocks.

Rocks are an important source of early human tools and are of great significance in human evolution. Therefore, the first period of human civilization is called the Stone Age. Rocks have always been an important material and tool for human life and production.

4. Which fiber has the highest tensile strength?

New material | Ultra-strong carbon nanofiber with tensile strength exceeding 80GPa is developed

May 28, 2018 One of the highest materials, its tensile strength is as high as 100GPa (specific strength up to 62.5GPa/(g/cm3)), which is 10 times that of T1000 carbon fiber...

5. What is the strongest substance known to mankind?

Graphene is the strongest substance known to mankind. It has excellent performance in terms of deformation resistance, elasticity and fracture resistance. Its strength is 100 times that of ordinary steel, its toughness is 20 times that of carbon fiber, and its hardness exceeds that of diamond. As a nanofiller, it can improve the quality of engineering plastics and prepare super-strong fibers. Its high flexibility and bendability can be used in fields such as flexible LCD panels.

6. When was the peak of painted paintings during the heyday of the Tang Dynasty?

With the prosperity of social economy and culture during the Sui and Tang dynasties in China, painting art achieved great success in subject matter, content and expression techniques, becoming one of the peaks in the history of Chinese painting.

Overview The Sui and Tang dynasties occupy an important position in Chinese history. Especially in the early stage of the Tang Empire, the vast territory, strong national strength and prosperous economy provided a material basis for cultural prosperity. The Tang Dynasty took various measures to strengthen the unity of all ethnic groups, and had close ties with countries in Central Asia, India, the Korean Peninsula, the Japanese Archipelago and other regions. It carried out extensive and in-depth economic and cultural exchanges, which made great progress in culture and art. It was under such social conditions that the rich and colorful paintings appeared. The Sui Dynasty lasted only 38 years, but its painting achievements were remarkable. Due to the unification of the country, famous masters from the north and south, such as Yang Zihua, Zhan Ziqian, Dong Boren, Zheng Fashi, Sun Shangzi, Yan Pi and others, gathered in Beijing and Luoyang to learn from each other and exchange. The rulers of the Sui Dynasty revived Buddhism, which enabled Buddhism, which had suffered a blow in the Northern Zhou Dynasty's destruction of Buddhism, to rise and spread again. Emperor Wen of the Sui Dynasty issued an edict to build temples, and religious art became active again, with large-scale creative activities. Temples in Chang'an, Luoyang, Jiangdu and other places were all painted by famous artists. There are more than 70 caves of the Sui Dynasty in the Mogao Grottoes in Dunhuang, and new explorations are being made in themes and styles. Paintings depicting portraits of aristocratic figures and living customs, which emerged in the Southern and Northern Dynasties, have also developed greatly. Landscape paintings, which mainly depict mountains and rivers, have begun to move away from naivety and gradually enter a mature stage. The rulers of the Sui Dynasty also attached great importance to the collection of ancient calligraphy and paintings. When the Sui Dynasty destroyed the Chen Dynasty, it collected all its palace collections. During the reign of Emperor Yang of Sui, Miaokai Terrace and Baoji Terrace were built behind the Guanwen Hall in Luoyang to collect famous calligraphy and paintings. The development of painting in the Sui Dynasty laid the foundation for the high prosperity of painting art in the Tang Dynasty.

The paintings of the Tang Dynasty were the pinnacle of the paintings of Chinese feudal society, and their artistic achievements far exceeded those of previous dynasties. The paintings of the early Tang Dynasty showed extraordinary achievements. Emperor Taizong of Tang Dynasty paid attention to the construction of culture while consolidating his regime. The painting activities of the brothers Yan Lide and Yan Liben and Yuchi Yiseng, as well as the murals represented by Cave 220 of Dunhuang, reflected the highest achievements of the painting art of this period. During the reign of Emperor Gaozong Li Zhi to Emperor Xuanzong Li Longji, on the basis of the prosperity of the regime and the prosperity of the society, the culture appeared rich and colorful, and a situation of hundreds of boats competing for the current appeared. Wu Daozi and his painting school reflected the great achievements of the nationalization of Buddhist art. The portraits of Qian Guoyang, Yin Jiyou, Fa Ming and others, the gorgeous figure paintings of Zhang Xuan and Yang Ning, the saddle horse paintings of Chen Hong, Wei Wudan and Cao Ba, the landscape paintings of Li Sixun, Li Zhaodao and his son, Lu Hong, Zheng Qian and others, the flower, bird, eagle and crane paintings of Feng Shaozheng, Xue Ji, Jiang Jiao and others, etc., implied the expansion of the subject matter. Dunhuang murals also reached their peak of prosperity at this time. The large offering statue in Cave 130 of Mogao Grottoes, the huge Pure Land Transformation in Caves 172 and 217, and the Vimalakirti Transformation in Cave 173 are all magnificent and exquisite mural masterpieces. After the An-Shi Rebellion, although the Tang Dynasty gradually declined, the art of painting continued to develop and improve, and made creative contributions in the creation of aristocratic ladies and religious murals. Poetry born in the prosperous and middle Tang Dynasty.

7. What was the transitional period of Tang poetry?

Early Tang poetry: Early Tang is the pioneering period of Tang poetry, and is the preparatory or preparatory stage for the prosperity of Tang poetry. Early Tang poetry is particularly important for the development of Tang poetry in the future in two aspects:

The first is to change the style of poetry, and the second is to improve the form of poetry.

Poetry of the High Tang Dynasty: The High Tang Dynasty was the golden age of Tang poetry, when Tang poetry reached its peak. The highest achievements of poetry in the High Tang Dynasty were represented by Li Bai and Du Fu.

Poetry in the Middle Tang Dynasty: The Middle Tang Dynasty was the heyday of Tang poetry, and also the period of transformation of Tang poetry. The Han-Meng School of Poetry and the Yuan-Bai School of Poetry are the two major schools of poetry in the Middle Tang Dynasty. Each of them has its own strengths and weaknesses, and their influences are also different.

Poetry in the late Tang Dynasty: The overall trend showed a decline. The most accomplished poets were Du Mu and Li Shangyin.

8. Which of the following is the most accomplished form of grotto art during the Northern and Southern periods?

Grotto art combines the characteristics of sculpture and painting, and embodies the highest artistic achievements during the Three Kingdoms, Wei, Jin, Southern and Northern Dynasties. In order to promote Buddhism, the rulers of the Northern Dynasties ordered people to cut mountains and cliffs, carve grottoes, and carve Buddha statues in many places, leaving behind exquisite and brilliant grotto art for future generations. Among them, the famous ones are the Yungang Grottoes in Datong, Shanxi and the Longmen Grottoes in Luoyang, Henan.

9. What is the highest strength level of stainless steel?

Stainless steel reaches high

It depends on the specific material, some can.

Stainless steel strength grades are divided into more than 10 grades, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. Among them, grade 8.8 and above stainless steel is made of low carbon alloy steel or medium carbon steel and is heat treated (quenched and tempered), which is generally called high-strength bolts, and the rest are generally called ordinary strength.

10. Is Zhongjian Technology’s carbon fiber the strongest?

Zhongjian Technology's carbon fiber has the highest strength.

Carbon fiber (CF) is made from organic matrix fibers such as polyacrylonitrile (PAN) (or asphalt, viscose) by carbonizing them under inert gas at a temperature above 1,000 degrees Celsius using a high-temperature decomposition method (the result is the removal of most elements except carbon). It is an inorganic polymer fiber with a carbon content of more than 90%.

Carbon fiber has excellent mechanical properties and chemical stability, lower density than aluminum and higher strength than steel. It is the fiber with the highest specific strength and highest specific modulus among the high-performance fibers currently produced in large quantities.