Zhu Changchao s information is urgent!!!!

Medium, beauty, you don't regret not meeting the password every year, solve the peasant economy next year, you haha didn't look at a few pieces and shouted to my sister to go home and take a look at the reflective mirror of the mountain reform plan orange is delineating each of you You will not be more difficult to take a holiday**Customer purchase method to buy a house**.

I'll give you a link.

Sound needs the vibration of an object, and I know that.

The Great Wall is a great miracle created by the ancient working people of China and a witness of China's long history. Together with Tiananmen Square and the Terracotta Warriors, it is regarded as a symbol of China by the world. Because of its length of more than 10,000 miles, it is also called the "Great Wall".

According to records, Qin Shi Huang used nearly one million laborers to build the Great Wall, accounting for 1 20 of the country's population, at that time there was no machinery, all labor had to rely on manpower, and the working environment was lofty mountains, cliffs and ravines. During the Spring and Autumn Period and the Warring States Period, in order to defend against the invasion of other countries, the princes and countries built beacon towers and connected them with city walls to form the earliest Great Wall. Most of the kings of the following dynasties strengthened and repaired.

The Great Wall stretches from Hushan in Dandong, Liaoning Province in the east to Jiayuguan in Gansu Province in the west, and passes through 10 provinces, autonomous regions and municipalities from east to west. The total length of the Great Wall is kilometers, of which the length of artificial walls is kilometers, and the length of moats and natural formations is kilometers.

The Great Wall of China is the greatest construction project in the history of human civilization, it was built more than 2,000 years ago in the Spring and Autumn Period and the Warring States Period, after the Qin Dynasty unified China, it was connected to form the Great Wall. In the Han and Ming dynasties, it was built on a large scale. Its engineering is vast and majestic, and it can be called a world miracle.

Now when you climb the ruins of the Great Wall in the past, you can not only witness the majestic posture of the Great Wall in the mountains, but also appreciate the wisdom and courage of the Chinese nation to create history.

The Great Wall of China is one of the greatest construction projects in the history of human civilization, and many years ago, the Great Wall of China was called one of the Seven Wonders of the Middle World. It was built during the Spring and Autumn Period and the Warring States Period, and the Great Wall was built after the Qin Dynasty unified China. Later generations of dynasties have been built, the Han and Ming dynasties built the scale is even larger, the existing Great Wall was built by the Ming Dynasty from the Bohai Mountain Customs to the Jiayuguan of Gansu Province, the average height of the Great Wall is meters, the average bottom is wide meters, and the top is meters.

It has rectangular stone platforms every 100 meters for lookouts.

Military defense projects in ancient China. A marvel in the history of world architecture. From the Yalu River in the east, to Jiayuguan in the west, passing through Liaoning, Hebei, Tianjin, Beijing, Inner Mongolia, Shanxi, Shaanxi, Ningxia, Gansu 9 provinces, municipalities and autonomous regions, with different terrain, mountains and landforms, most of them are built in the highest part of the mountain range, with a total length of 7,300 kilometers (14,600 miles) or more, known as the Great Wall.

Among them, the section from the Yalu River to Shanhaiguan is relatively simple and the damage is more serious. Shanhaiguan to Jiayuguan section, the project is relatively solid, the preservation is also relatively complete, the two Guancheng at both ends face each other from east to west, the length is 6,700 kilometers (13,400 miles).