The solution of 1. equation is ()
A.x=0 B. x= 1 C.x=2 D.x=3
2. If 2x-7y=8, then it is correct to represent x () with the algebraic expression of y..
A.B. C. D。
3. The following statement is true ()
A. A linear equation with one variable must have only one solution; B the binary linear equation x+y = 2 has countless solutions;
C. Equation 2x = 3x has no solution; D. the value of the unknown quantity in the equation is the solution of the equation.
Xiao Ming accidentally polluted a constant in the equation when he was solving it. The pollution equation is 2y- = y-●. what should he do ？ Xiao Ming thought about it and looked at the answer at the back of the book. The solution of this equation is y =-
This constant is filled up quickly, and it should be ().
A. 1
5. The following inequality is a one-dimensional linear inequality ().
A.2( 1-y)>4y+2 b . x(2-x)≥ 1 c .+>d . x+l & lt； y+2
6. The number of positive integer solutions of inequality 2x-2≥3x-4 is ().
1。
7. The value of algebraic expression 1-m is greater than-1 and not greater than 3, so the value range of m is ().
8. The following statement is wrong ()
A. The midline, angle bisector and height line of a triangle are all line segments;
B the sum of the external angles of any triangle is 3600;
C. Triangles can be divided into equilateral triangles and isosceles triangles according to their sides;
D. One external angle of a triangle is greater than any internal angle.
9. In △ABC, ∠ A-∠A-∠B = 900, then △ABC is a () triangle.
A. acute triangle; B. right triangle; C. obtuse triangle; D. not sure
10. If you want to restore the original price of a commodity after a price increase of 20%, the percentage that must be reduced is about ().
a . 17%； b . 18%； c . 19%； D. 20% .
Fill in the blanks (3 points for each small question, 33 points for * * *)
1 1. A number plus 5 equals twice its minus 9. Let a number be x and get the equation.
12. If +(x+2y) 2 = 0, then x = _ _ _ _ _ _ and y = _ _ _ _ _ _
13. in the equation Y = KX+B, when X = 0, y =-1; When x = 1 and y = 2, then k = _ _ _ _, and b = _ _ _ _.
14. The picture shows the price tag of a shampoo in "Star Supermarket".
So the original price of this shampoo is.
15. The lengths of the three sides of the triangle are 41-2a,7 respectively, so the value range of a is
16. A test paper * * * has 20 multiple-choice questions, with a total score of 100. If each question is selected correctly, score 5 points, and if it is selected incorrectly, deduct 1 point. If a student gets at least 88 points, he will at least choose _ _ _ _ _.
17. The solution set of inequality group is
18. Find the number of times ∠ 1 in the figure below.
( 1) (2) (3)
19. A depositor deposited 25,000 yuan in the bank for one year, and deducted 20% interest income tax when taking it out, and got 25,396 yuan. Ask the depositor for the kind of interest rate.
If _ _ _ _ _ _ _ _ _ _ _ _, the equation (or equation) listed is _ _ _ _ _ _ _ _ _ _.
20. As shown in the figure, ∠A=280, ∠B=420, ∠DFE= 1300, then ∠C= degrees.
2 1. If 3x+7y+z = 5 and 4x+Loy+z = 3, then the value of x+y+z is equal to _ _ _ _.
Iii. Drawing problems (please keep drawing traces, ***6 points)
22. Please make an obtuse triangle at will and make the heights of its three sides.
Four, solving equations (or equations) (23 small 5 points, 24~26 small 6 points, ***23 points)
23.3x-2=5x+6 24。
25.26.
V. Answer questions (6 points for 27 minor questions, 9 points for each minor question for 28~30 minor questions, and 33 points for * * *).
27. When k takes any value, its value is smaller than its value 1.
28. It is known that the solution of the equation is the same as that of the equation, so find A and B. 。
29. Given the same symbol as the value of, find the value range of A. ..
30. As shown in the figure, in △ABC, AD is the angular bisector, ∠B=660, ∠C=540. Find the degree of ∠ADB and ∠ADC
Class: Name: Student ID:
First, multiple-choice questions (3 points for each small question, 30 points for * * *)
The solution of 1. equation is ()
A.x=0 B. x= 1 C.x=2 D.x=3
2. If 2x-7y=8, then it is correct to represent x () with the algebraic expression of y..
A.B. C. D。
3. The following statement is true ()
A. A linear equation with one variable must have only one solution; B the binary linear equation x+y = 2 has countless solutions;
C. Equation 2x = 3x has no solution; D. the value of the unknown quantity in the equation is the solution of the equation.
Xiao Ming accidentally polluted a constant in the equation when he was solving it. The pollution equation is 2y- = y-●. what should he do ？ Xiao Ming thought about it and looked at the answer at the back of the book. The solution of this equation is y =-
This constant is filled up quickly, and it should be ().
A. 1
5. The following inequality is a one-dimensional linear inequality ().
A.2( 1-y)>4y+2 b . x(2-x)≥ 1 c .+>d . x+l & lt； y+2
6. The number of positive integer solutions of inequality 2x-2≥3x-4 is ().
1。
7. The value of algebraic expression 1-m is greater than-1 and not greater than 3, so the value range of m is ().
8. The following statement is wrong ()
A. The midline, angle bisector and height line of a triangle are all line segments;
B the sum of the external angles of any triangle is 3600;
C. Triangles can be divided into equilateral triangles and isosceles triangles according to their sides;
D. One external angle of a triangle is greater than any internal angle.
9. In △ABC, ∠ A-∠A-∠B = 900, then △ABC is a () triangle.
A. acute triangle; B. right triangle; C. obtuse triangle; D. not sure
10. If you want to restore the original price of a commodity after a price increase of 20%, the percentage that must be reduced is about ().
a . 17%； b . 18%； c . 19%； D. 20% .
Fill in the blanks (3 points for each small question, 33 points for * * *)
1 1. A number plus 5 equals twice its minus 9. Let a number be x and get the equation.
12. If +(x+2y) 2 = 0, then x = _ _ _ _ _ _ and y = _ _ _ _ _ _
13. in the equation Y = KX+B, when X = 0, y =-1; When x = 1 and y = 2, then k = _ _ _ _, and b = _ _ _ _.
14. The picture shows the price tag of a shampoo in "Star Supermarket".
So the original price of this shampoo is.
15. The lengths of the three sides of the triangle are 41-2a,7 respectively, so the value range of a is
16. A test paper * * * has 20 multiple-choice questions, with a total score of 100. If each question is selected correctly, score 5 points, and if it is selected incorrectly, deduct 1 point. If a student gets at least 88 points, he will at least choose _ _ _ _ _.
17. The solution set of inequality group is
18. Find the number of times ∠ 1 in the figure below.
( 1) (2) (3)
19. A depositor deposited 25,000 yuan in the bank for one year, and deducted 20% interest income tax when taking it out, and got 25,396 yuan. Ask the depositor for the kind of interest rate.
If _ _ _ _ _ _ _ _ _ _ _ _, the equation (or equation) listed is _ _ _ _ _ _ _ _ _ _.
20. As shown in the figure, ∠A=280, ∠B=420, ∠DFE= 1300, then ∠C= degrees.
2 1. If 3x+7y+z = 5 and 4x+Loy+z = 3, then the value of x+y+z is equal to _ _ _ _.
Iii. Drawing problems (please keep drawing traces, ***6 points)
22. Please make an obtuse triangle at will and make the heights of its three sides.
Four, solving equations (or equations) (23 small 5 points, 24~26 small 6 points, ***23 points)
23.3x-2=5x+6 24。
25.26.
V. Answer questions (6 points for 27 minor questions, 9 points for each minor question for 28~30 minor questions, and 33 points for * * *).
27. When k takes any value, its value is smaller than its value 1.
28. It is known that the solution of the equation is the same as that of the equation, so find A and B. 。
29. Given the same symbol as the value of, find the value range of A. ..
30. As shown in the figure, in △ABC, AD is the angular bisector, ∠B=660, ∠C=540. Find the degree of ∠ADB and ∠ADC
Six, column equation (group) to solve application problems (*** 10)
3 1. The ticket prices of People's Park are as follows:
Number of ticket buyers1~ 40,41~ 80,80 people.
Admission price per person 10 yuan, 8 yuan and 9 yuan.
A total of 85 students from Grade Three (1) and (2) in a school visited People's Park. Among them, (1) class is a small class with fewer students, and (2) class has more students. It is estimated that if two classes buy tickets separately, it will cost 65438 more than two classes combined.
Seven, comprehensive questions (* *15 points)
32. In order to choose the monitor from students A and B, a class conducted a speech defense and democratic evaluation. Five teachers, A, B, C, D and E, as judges, evaluated the situation of "speech defense", and 50 students in the whole class participated in the democratic evaluation. The results are shown in the following table:
Table 1 speech defense score table (unit: points)
A B C D E
90 92 94 95 88
B 89 86 87 94 9 1
Table 2 Statistics of democratic evaluation votes (unit: Zhang)
"Good" ticket "Good" ticket "Ordinary" ticket
A 40 7 3
B 42 4 4
Rules: The score of speech defense is determined by the method of "removing a highest score and a lowest score, and then calculating the average score"; Democratic evaluation score = 2 points for "good" votes+0 points for "better" votes 1 point+0 points for "ordinary" votes; Comprehensive score = speech defense score (1-a)+ democratic evaluation score a.
(1) When a=0.6, what is the comprehensive score of A?
(2) In what range does A score high? In what range is the comprehensive score of A and B high?
Six, column equation (group) to solve application problems (*** 10)
3 1. The ticket prices of People's Park are as follows:
Number of ticket buyers1~ 40,41~ 80,80 people.
Admission price per person 10 yuan, 8 yuan and 9 yuan.
A total of 85 students from Grade Three (1) and (2) in a school visited People's Park. Among them, (1) class is a small class with fewer students, and (2) class has more students. It is estimated that if two classes buy tickets separately, it will cost 65438 more than two classes combined.
Seven, comprehensive questions (* *15 points)
32. In order to choose the monitor from students A and B, a class conducted a speech defense and democratic evaluation. Five teachers, A, B, C, D and E, as judges, evaluated the situation of "speech defense", and 50 students in the whole class participated in the democratic evaluation. The results are shown in the following table:
Table 1 speech defense score table (unit: points)
A B C D E
90 92 94 95 88
B 89 86 87 94 9 1
Table 2 Statistics of democratic evaluation votes (unit: Zhang)
"Good" ticket "Good" ticket "Ordinary" ticket
A 40 7 3
B 42 4 4
Rules: The score of speech defense is determined by the method of "removing a highest score and a lowest score, and then calculating the average score"; Democratic evaluation score = 2 points for "good" votes+0 points for "better" votes 1 point+0 points for "ordinary" votes; Comprehensive score = speech defense score (1-a)+ democratic evaluation score a.
(1) When a=0.6, what is the comprehensive score of A?
(2) In what range does A score high? In what range is the comprehensive score of A and B high?
Class: Name: Student ID:
First, multiple-choice questions (3 points for each small question, 30 points for * * *)
The solution of 1. equation is ()
A.x=0 B. x= 1 C.x=2 D.x=3
2. If 2x-7y=8, then it is correct to represent x () with the algebraic expression of y..
A.B. C. D。
3. The following statement is true ()
A. A linear equation with one variable must have only one solution; B the binary linear equation x+y = 2 has countless solutions;
C. Equation 2x = 3x has no solution; D. the value of the unknown quantity in the equation is the solution of the equation.
Xiao Ming accidentally polluted a constant in the equation when he was solving it. The pollution equation is 2y- = y-●. what should he do ？ Xiao Ming thought about it and looked at the answer at the back of the book. The solution of this equation is y =-
This constant is filled up quickly, and it should be ().
A. 1
5. The following inequality is a one-dimensional linear inequality ().
A.2( 1-y)>4y+2 b . x(2-x)≥ 1 c .+>d . x+l & lt； y+2
6. The number of positive integer solutions of inequality 2x-2≥3x-4 is ().
1。
7. The value of algebraic expression 1-m is greater than-1 and not greater than 3, so the value range of m is ().
8. The following statement is wrong ()
A. The midline, angle bisector and height line of a triangle are all line segments;
B the sum of the external angles of any triangle is 3600;
C. Triangles can be divided into equilateral triangles and isosceles triangles according to their sides;
D. One external angle of a triangle is greater than any internal angle.
9. In △ABC, ∠ A-∠A-∠B = 900, then △ABC is a () triangle.
A. acute triangle; B. right triangle; C. obtuse triangle; D. not sure
10. If you want to restore the original price of a commodity after a price increase of 20%, the percentage that must be reduced is about ().
a . 17%； b . 18%； c . 19%； D. 20% .
Fill in the blanks (3 points for each small question, 33 points for * * *)
1 1. A number plus 5 equals twice its minus 9. Let a number be x and get the equation.
12. If +(x+2y) 2 = 0, then x = _ _ _ _ _ _ and y = _ _ _ _ _ _
13. in the equation Y = KX+B, when X = 0, y =-1; When x = 1 and y = 2, then k = _ _ _ _, and b = _ _ _ _.
14. The picture shows the price tag of a shampoo in "Star Supermarket".
So the original price of this shampoo is.
15. The lengths of the three sides of the triangle are 41-2a,7 respectively, so the value range of a is
16. A test paper * * * has 20 multiple-choice questions, with a total score of 100. If each question is selected correctly, score 5 points, and if it is selected incorrectly, deduct 1 point. If a student gets at least 88 points, he will at least choose _ _ _ _ _.
17. The solution set of inequality group is
18. Find the number of times ∠ 1 in the figure below.
( 1) (2) (3)
19. A depositor deposited 25,000 yuan in the bank for one year, and deducted 20% interest income tax when taking it out, and got 25,396 yuan. Ask the depositor for the kind of interest rate.
If _ _ _ _ _ _ _ _ _ _ _ _, the equation (or equation) listed is _ _ _ _ _ _ _ _ _ _.
20. As shown in the figure, ∠A=280, ∠B=420, ∠DFE= 1300, then ∠C= degrees.
2 1. If 3x+7y+z = 5 and 4x+Loy+z = 3, then the value of x+y+z is equal to _ _ _ _.
Iii. Drawing problems (please keep drawing traces, ***6 points)
22. Please make an obtuse triangle at will and make the heights of its three sides.
Four, solving equations (or equations) (23 small 5 points, 24~26 small 6 points, ***23 points)
23.3x-2=5x+6 24。
25.26.
V. Answer questions (6 points for 27 minor questions, 9 points for each minor question for 28~30 minor questions, and 33 points for * * *).
27. When k takes any value, its value is smaller than its value 1.
28. It is known that the solution of the equation is the same as that of the equation, so find A and B. 。
29. Given the same symbol as the value of, find the value range of A. ..
30. As shown in the figure, in △ABC, AD is the angular bisector, ∠B=660, ∠C=540. Find the degree of ∠ADB and ∠ADC
Six, column equation (group) to solve application problems (*** 10)
3 1. The ticket prices of People's Park are as follows:
Number of ticket buyers1~ 40,41~ 80,80 people.
Admission price per person 10 yuan, 8 yuan and 9 yuan.
A total of 85 students from Grade Three (1) and (2) in a school visited People's Park. Among them, (1) class is a small class with fewer students, and (2) class has more students. It is estimated that if two classes buy tickets separately, it will cost 65438 more than two classes combined.
Seven, comprehensive questions (* *15 points)
32. In order to choose the monitor from students A and B, a class conducted a speech defense and democratic evaluation. Five teachers, A, B, C, D and E, as judges, evaluated the situation of "speech defense", and 50 students in the whole class participated in the democratic evaluation. The results are shown in the following table:
Table 1 speech defense score table (unit: points)
A B C D E
90 92 94 95 88
B 89 86 87 94 9 1
Table 2 Statistics of democratic evaluation votes (unit: Zhang)
"Good" ticket "Good" ticket "Ordinary" ticket
A 40 7 3
B 42 4 4
Rules: The score of speech defense is determined by the method of "removing a highest score and a lowest score, and then calculating the average score"; Democratic evaluation score = 2 points for "good" votes+0 points for "better" votes 1 point+0 points for "ordinary" votes; Comprehensive score = speech defense score (1-a)+ democratic evaluation score a.
(1) When a=0.6, what is the comprehensive score of A?
(2) In what range does A score high? In what range is the comprehensive score of A and B high?
Responder: 00 tearful smile 00-level 3 2009-6-23 19:48
History:
First, multiple-choice questions (2 points for each question, 25 questions, ***50 points)
1, the rule of an emperor in the Tang Dynasty, was called by Mr. Guo Zhuoruo as "opening the century with politics and governing the macro festival". This emperor is
A, Emperor Taizong B, Tang Gaozong
C, Wu Zetian D, Tang Xuanzong
2. The second "person" in "Take copper as a mirror, you can dress your clothes, and take people as a mirror, you can know the gains and losses" refers to
Party A, Party B and Party B
C, Du Ruhui D, Yao Chong
3. In which dynasty was the imperial examination system founded and abolished?
A, Sui Dynasty, Ming Dynasty B, Sui Dynasty, Qing Dynasty
C, Tang Dynasty, Ming Dynasty D, Tang Dynasty, Qing Dynasty
4. If you were the minister in charge of ethnic affairs in the early Tang Dynasty, which of the following ethnic affairs would you often handle?
(1) Tubo (2) Uighur (3) Turkic (4) Mohe.
a、①②③ B、①②④
c、②③④ D、①②③④
5. The events that did not happen during the reign of Emperor Xuanzong of the Tang Dynasty are as follows.
First, Jian Zhen eastward into Japan.
B. Xuanzang's Journey to the West
C, Nanzhao leader was named king of Yunnan.
D. Appoint Yao Chong, who is full of reform spirit, as Prime Minister.
6. The minority regimes coexisting with the Song Dynasty are as follows
① Liao ② Xixia ③ Jin ④ Haidong Guo Sheng
a、①② B、①②④
c、②③ D、①②③
7. Crossing is just a visit. If you are a citizen of the Song Dynasty, which of the following social characteristics can you see?
At that time, you could see a dazzling array of goods in the commercial city, including exquisite Jingdezhen porcelain.
In summer, you can have cold drinks in the night market and Wali.
③ Sichuanese can use jiaozi.
(4) Urban civilians live in quadrangles, and businesses can go to the ground to stay.
Scholar-officials usually ride horses when traveling.
a、①②③ B、③④⑤
c、①②③④⑤ D、①②④⑤
8. A poet in the Southern Song Dynasty once wrote: "When will the West Lake dance stop?" Warm winds make tourists drunk and Hangzhou a continent. "The main purpose of writing this poem is
First, praise the prosperity of Hangzhou
B, satirize the rulers of the rulers.
C, wrote about the beauty of the West Lake and the relationship between people.
D, satirize the drunken dream of the rulers of the Southern Song Dynasty.
9. Zi Tong Zhi Jian by Sima Guang, a historian of the Northern Song Dynasty, is a chronicle general history. What historical periods can you learn from this book?
① Spring and Autumn Period ② Warring States Period ③ Han Dynasty ④ Tang Dynasty ⑤ Song Dynasty
a、①②③④ B、②③④⑤
c、②③④ D、①②③④⑤
10, "The river of no return, the waves are exhausted, the romantic figures of the ages ..." This is a poem entitled "Niannujiao Chibi Nostalgia", written by?
A, Su Shi B, Li Qingzhao
C, Xin Qiji D, Lu You
1 1, the establishment of provincial administrative regions in China began in
A, Tang Dynasty B, Song Dynasty
C, Yuan Dynasty D, Ming Dynasty
12, Genghis Khan's achievements are mainly
A, the demise of Xixia b, the unification of Mongolia
C, the establishment of the Yuan Dynasty D, the capital of Dadu
13, a businessman living in the Yuan Dynasty, can't have any experience.
First, go to Jiangnan to traffic cotton cloth
B, travel to Hangzhou via the canal.
C, a dream of red mansions given to him by a friend.
D, buy Jingdezhen real flower porcelain
14, which of the following is not conducive to the strengthening of absolute monarchy in the early Ming Dynasty?
A. Abolish the Prime Minister B. Establish the East Factory
C, enfeoffment captaincy D, moved to Beijing.
15, if you follow Zheng He's fleet to the Western Ocean, which of the following places have not been visited by the fleet?
A. Indian Ocean Coast
B. Red Sea Coast
C. East coast of Africa
D. Mediterranean coast
16. What was the longest canal in the ancient world?
I. Zheng Guoqu
B. Lingqu
C, sui dynasty grand canal
D. Grand Canal in Yuan Dynasty
17, 16- 17 the century western invaders who invaded China were?
(1) the Netherlands, Russia, Portugal and Britain.
a、①②③ B、②③④
c、①②④ D、①②③④
18. The torch relay of Athens Olympic Games arrived in Beijing on June 8, 2004, after which the Olympic torch will be lit at the Great Wall. Do you know what the Great Wall we are talking about now is?
I. Qin Changcheng
B, Han Great Wall
C. Ming Great Wall
D. Yunnan Great Wall
19. What information do you want to know more about the development of handicrafts in China in the17th century?
A, Tiangong Kaiwu B, Compendium of Materia Medica
C, Encyclopedia of Agricultural Administration D, Compendium of Materia Medica of Tang Dynasty
20, China's earliest long historical novel is
A, Romance of the Three Kingdoms B, Water Margin
C, Journey to the West D, Dream of Red Mansions
2 1, the symbol of the germination of capitalism in the middle and late Ming Dynasty is
A, the level of handicraft industry exceeds that of the previous generation.
B. the development of commodity economy and the expansion of foreign trade
C, handicraft workshops increased
D, there is a "machine user contribution, mechanic contribution" computer room.
22. Which emperor often quotes Xunzi: "Jun, the boat is also; People, water also. Water can carry a boat or overturn it. "
A. Sui Wendi
B. Emperor Taizong
C. Song Taizu
D. Ming Taizu
23. The colonialists who have occupied Taiwan Province for 38 years in history are
A. Portugal
B. Netherlands
C. Britain, Britain
D. France
24. "Tang poetry, Song poetry, Ming and Qing novels" is a summary of the literary achievements of these dynasties. The following statement is incorrect.
A. Li Bai, Du Fu and Bai Juyi have the highest achievements and the greatest influence in Tang poetry.
Famous poets in Song Dynasty include Su Shi, Li Qingzhao and Xin Qiji.
A Dream of Red Mansions written by Cao Xueqin in Qing Dynasty is the peak of classical novels.
D. Poetic immortals are a compliment to Li Bai, and poetic immortals are a compliment to Du Fu.
25. Literary inquisition imprisons ideas and seriously hinders social progress. Its scale and frequency are incalculable.
I. Han Dynasty
B. Tang dynasty
C. Ming dynasty
D. Qing dynasty
Second, the material problem (this question is 3 small questions, ***45 points)
26. Read the material and answer the questions.
"My nephew is the uncle and aunt of the first emperor, and it is given by Princess Jincheng, so it is a family. All the people in the world are happy. "
-Kridê Zukzain's letter to the emperor of the Tang Dynasty
(1) Which nationality did the above materials reflect the friendly relations between the Tang Dynasty and? What is another historical fact that the Tang Dynasty and this nation were "harmonious as one family"?
(2) What institutions were set up in the early Qing Dynasty to strengthen the jurisdiction of this ethnic area? In which autonomous region of China does this nation mainly live today?
27. Material 1: Before the Ming Dynasty, China was the most economically and technologically developed country in the world. However, when the Opium War broke out in 1840, China's per capita grain was only about 200 kg, and the United States was close to 1000 kg. The annual output of iron in China is about 20,000 tons, less than one tenth of that in France and one fortieth of that in Britain. China's shipbuilding and navigation industry has been ahead of the world for a long time, and it also declined rapidly in the Qing Dynasty. The Chinese fleet that once appeared in Southeast Asia disappeared and was replaced by the fleet of western countries. Compared with the West in the middle and late Ming Dynasty, China's science and technology still had its own advantages and disadvantages, but by 1840, it had fallen behind the West in an all-round way.
Material 2: After more than 20 years of reform and opening up, China's economic strength has been greatly improved. Statistics in 2003 show that China's gross national product is close to 1.2 trillion yuan, ranking sixth in the world. This has laid a solid foundation for the development of all walks of life and the improvement of people's lives.
At present, China's economic development momentum is very good. We have every reason to believe that in the next four years, China's economy will maintain a relatively high development speed, and the gap between China and the developed countries in the world will be further narrowed, showing the world that we are bidding farewell to poverty and backwardness and creating a rich and powerful life.
Answer the questions after reading the material:
(1) List two scientific and technological achievements that China led the world before the Ming Dynasty.
(2) What do you think is the main reason for China's backward economy and technology?
(3) What do you think of the different results of comparative material 1 and material 2?
28. Material 1: According to Xinhuanet, the South-to-North Water Diversion Project in China, which has attracted worldwide attention, will start construction within this year after decades of planning and demonstration. According to the plan, the ancient Beijing-Hangzhou Grand Canal will serve as the main channel for transporting water from the Yangtze River to the north. The first phase of the Eastern Line Project has a static investment of 32 billion yuan and a construction period of 5 years. It mainly supplies water to Shandong and Jiangsu provinces through the Beijing-Hangzhou Grand Canal. The project scale is 8.9 billion cubic meters, including 3.9 billion cubic meters of new water supply.
Material 2: For thousands of years, the Beijing-Hangzhou Grand Canal has been an important north-south waterway in China, which has played a very important role in national unity, economic prosperity, cultural integration, opening up and international exchanges. This ancient canal still plays an important role in China's economic development, from "transporting grain from the south to the north" and "transporting salt" in history to the trunk line of "transporting coal from the north to the south" and the main stream of flood control irrigation.
Read the material to answer questions:
(1) Do you know which dynasty the Grand Canal mentioned in the materials was built? Please give a brief introduction.
(2) What role did the Grand Canal play in history? What new mission does the Grand Canal undertake now?
Three. Questions and answers (15)
29. China's four great inventions are the crystallization of the wisdom of ancient working people, which have played a very important role in the spread and development of world economy and culture. Please introduce two inventions of the Northern Song Dynasty.