Xia dynasty (2 1 century-BC16th century) was the first hereditary dynasty recorded in China's history books. It is generally believed that Xia Dynasty was a country with multiple tribal alliances or complex emirates. According to historical records, Yuchuan is located in Zi Qi, which changed the abdication system of primitive tribes and created a hereditary precedent in China for nearly 4,000 years. In the history of China, "home is the world" began with the establishment of the Xia Dynasty.
Summer begins in the west of Henan Province and the south of Shanxi Province, east to the junction of Henan Province, Shandong Province and Hebei Province, south to the north of Hubei Province and north to the south of Hebei Province. The geographical center of this area is today's Yanshi, Dengfeng, Xinmi and Yuzhou, covering an area of about 265,438+10,000 square kilometers.
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Fractal geometry not only shows the beauty of mathematics, but also reveals the essence of the world and changes the way people understand the mysteries of nature. It can be said that fractal geometry is a kind of geometry that truly describes nature, and the research on it has greatly expanded the cognitive field of human beings.
Undoubtedly, the academic style of the new left has had a far-reaching impact on the field of modern and contemporary literature research. Traditional literature research has been despised, and literature has once again become evidence of the history of thought. More often than not, materials are worthless. The sociological study of literature has been extended to the field of political criticism, in which attitudes and positions often play a decisive role.
China is located in the east of Asia and the west coast of the Pacific Ocean. It starts from the center of Heilongjiang near Mohe in the north and reaches Zengmu shoal in Nansha Islands in the south. It starts from Pamirs in the west and ends at the intersection of Heilongjiang and Wusuli rivers in the east. The land area is 9.6 million square kilometers and the land boundary is more than 20,000 kilometers.
The territorial sea consists of the Bohai Sea (inland sea), the Yellow Sea, the East China Sea and the South China Sea, and the coastline of the eastern and southern continents is1.8000 km long. The inland and offshore waters cover an area of about 4.7 million square kilometers. There are 7,600 large and small islands in the sea area, of which Taiwan Province Island is the largest, with an area of 35,798 square kilometers.
Bohai Sea is located in the Bohai Strait from Laotieshan Angle of Liaodong Peninsula to Penglai Angle on the northern shore of Shandong Peninsula, and is connected with the Yellow Sea. There is a Miangen Gorge in miaodao islands, covering an area of 77,000 square kilometers, with an average water depth of18m and the deepest point of 70m.