北京精雕软件心得体会下载报告 北京精雕软件入门教程(三篇)

学习中的快乐，产生于对学习内容的兴趣和深入。世上所有的人都是喜欢学习的，只是学习的方法和内容不同而已。那么我们写心得体会要注意的内容有什么呢？以下是小编帮大家整理的心得体会范文，欢迎大家借鉴与参考，希望对大家有所帮助。

对于北京精雕软件心得体会下载报告一

the great wall is a magnificent defensive building in ancient china. itstarts from shanhaiguan in the east and ends at jiayuguan in the west, and runsacross the north of china. winding more than 12000 li, it is famous for the"great wall". it was listed in the world cultural heritage list in 1987. it iscalled "the longest defensive wall in the world" by experts and scholars.

the first time that china built the great wall was in the spring and autumnperiod in the 7th century bc, and the earliest country to build the great wallwas the state of chu. the great wall of the state of chu is called "fangcheng"in historical records, with a length of nearly a thousand li. qi was also one ofthe earliest states to build the great wall. the great wall of qi started frompingyin in shandong province in the west and entered the sea in the east. it isthe most preserved site of the great wall in the spring and autumn period.

qin shihuang was born in 220 bc__ after the unification of china in 1949,the old great wall in the north of qin, zhao and yan was first repaired. at thecost of "building a city of thousands of miles and building a people ofthousands of miles", he began to build the great wall, which is more than 7000kilometers long, from lintao in the west to liaodong in the east. since then,the great wall has stood in the east of the world, experiencing thousands ofyears of wind, frost, rain and snow.

in the early western han dynasty, in order to resist aggression and protectthe newly developed "silk road". it has built a great wall of more than 10000kilometers from lop nor in xinjiang in the west to liaodong in the east. this isalso the longest great wall in the history of our country.

after the establishment of ming dynasty, it faced the threat of mongoliaand jurchen. from the beginning of zhu yuanzhang, general xu da was sent northto build the great wall. until the end of ming dynasty, it was overhauled 18times, lasting more than 260 years. until hongzhi 20__ in, it was completed fromthe yalu river in the east to jiayuguan in the west. through liaoning, hebei,beijing, shanxi, shaanxi, inner mongolia, ningxia, gansu and other provinces andautonomous regions. the great wall is more than 12700 li long. and along thegreat wall is pided into nine defense areas, known as "nine sides and ninetowns". moreover, in many important pass areas, especially in the north ofbeijing city, multiple walls were built. these are the badaling great wall wesee now.

the scale of the great wall built in the qin, han and ming dynasties is thelargest compared with other dynasties. so the three construction climaxes inhistory are the qin dynasty, the han dynasty and the ming dynasty.

now, let me introduce the badaling great wall. badaling great wall islocated in yanqing county, northwest of beijing. it is the best preservedsection of the great wall in beijing with the best engineering quality and themost rigorous structure. this section of the great wall takes the urn city asthe center, reaching the seventh floor in the south and the twelfth floor in thenorth, with a total length of 4770 meters. it is the only channel leading to theoutside of the great wall in beijing area and the front position of here, you can reach yongning and sihai in the east, xuanhua and datong inthe west, jingcheng in the south, yanqing in the north and badaling in alldirections. badaling pass was built in 1520__ the city is 7.5 meters high and 4meters thick. there is a plaque on each of the east and west gates, with "juyongwai town" in the east and "north gate lock key" in the west. at the entrance ofguancheng, there is a cannon with a length of 2.85 meters and a caliber of 10.5cm, which is called "shenwei general". now let's look at the wall of the greatwall in badaling. this section of the city wall is about 5.8 meters narrow atthe top and 6.5 meters wide at the bottom. it consists of four basic structures.1、 city wall, two, city tower, three, pass, four, beacon tower. there is aticket door in the wall and a stone ladder in the middle. the top can hold 5horses in parallel. beacon tower is also known as beacon, beacon, wolf is independent of the city wall, almost every other mile there is a, composedof the great wall defense alarm system.

whenever enemy troops invade, the beacon towers burn beacon fires to conveymilitary information. burning smoke during the day is called beacon. at night afire is called a flint. and because wolf dung is often used as fuel, the smokeis high and hard to dissipate, so it is also called "wolf smoke". moreover, itwas stipulated in the ming dynasty. more than 100 of the invading soldiers lit acigarette and fired a gun, about 500 soldiers fired two cigarettes a