风铃结香
Dujiang weirs constructs in 256 B.C., is the world until now, the age is most long, only preserves, take the non-dam pilot as the characteristic great hydraulic engineering.2000 for many years, it has been playing the flood prevention irrigation role continuously, causes the Chengdu plain to become the flood and drought from the human, the vast fertile area land of abundance.World culture inheritance - Dujiang weirs tourist area for national AAAA level traveling scenic area, state-level scenery scenic spot area.The Minjiang River is upstream a Yangtze River's big branch, originates north Sichuan the mountain area.Whenever spring summer mountain flooding, river water galloping under, enters the Chengdu plain, because the river course is narrow, as soon as the ancient times cause the flood disaster frequently, the flood draw back, also is the grit great distance.East but the Guanxian Minjiang River east bank jade builds the mountain to hinder east the river water to flow, creates west the drought the waterloggingNo matter what the Suchuan county grand minister superintendent of KULUN, he benefits the people, removed trouble of the flood disaster, the management has constructed the famous Dujiang weirs hydraulic engineering.Dujiang weirs's principal part of a project is divides into the Minjiang River current of water two, current of water introduces the Chengdu plain, like this both may reduce the flood reduces disaster, and had achieved channels water to irrigate fields, turns bad to good.Moreover converges Yangtze River.Dujiang weirs hydraulic engineering most main part for Dujiang weirs headwork, this is in the Dujiang weirs irrigation system is most essential, the most important facility.The Dujiang weirs headwork mainly by the fish mouth divergence dike, flies the weir on sand spillway and the valuable bottle mouth drainage project three major part is composed.It solved the river water automatic divergence, the automatic discharge of silt scientifically, has controlled questions and so on discharge of water, three head and tail docking, took care of mutually, the day becomes quite the same as, wonderful workmanship.
调皮捣蛋妈
Dujiangyan (Chinese: 都江堰; Pinyin: Dūjiāngyàn) is a county-level city of Chengdu, Sichuan Province in China. It has an area of 1208 square kilometers and a population of 600,000 in 2003.[1]Historically known as Guanxian, the city was renamed in honor of the Dujiangyan Irrigation System, located in the northwestern area of the city, famous for still providing neighboring major city Chengdu with water even though it was built around 250 BC.Around 250BC during the Warring States Period (475-221BC), Li Bing, a governor of Shu in the Qin state (present Sichuan Province) with his son directed the construction of Dujiangyan. The governor gave up the old way of dam building, which was simply try to catch the floodwaters. Instead he employed a new method by channeling and dividing the water to harness the Min River. He accomplished this by separating the project into two main parts: the headwork and the irrigation system. The project effectively put flood waters under control. For over two thousand years the whole system has functioned perfectly, serving not only for flood prevention but also as an immense source for irrigation and a means to facilitate shipping and wood drifting. It has contributed greatly to the richness of Chengdu Plain with its reputation as "The Land of Abundance".On 12 May 2008, the city was the closest to the epicenter the 2008 Sichuan earthquake and the city suffered severe damage. Xinjian Primary School, Juyuan Middle School, and Xiang'e Middle School collapsed in the earthquake; Beijie Primary School did not collapse.[2][3][4]
Dujiang weirs constructs in 256 B.C., is the world until now, the age is most lo
guodong930 2人参与回答 2023-12-07 我们在撰写毕业论文时，学校会制定标准，目的就是为了统一我们的论文格式和内容质量。除了这些，对于论文重复率也是有一定要求的。今天小编就来详细说说论文查重的相关标准
长腿蚊子 6人参与回答 2023-12-12 一、论文怎么查重： 1、论文写完后查重前先向学校或机构了解清楚指定的是哪个论文查重系统、次数以及要求的查重率标准是多少？ 2、由于学校或机构提供的查重系统次数非
帅气小王子… 6人参与回答 2023-12-09 主要还是因为这些东西都是有人开发出来的，不可能免费给使用是要收取费用的。
e元素789 6人参与回答 2023-12-07 毕业论文查重时写完论文后必不可少的毕业论文查重通过后就可以参与答辩；在答辩前，论文查重的重复率都是需要符合学校的要求，那么毕业论文重复率不能超过多少？论文重复率
梦紫蝶57 7人参与回答 2023-12-06