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2、 1. Gas exchange between respiratory tract and lung when gas comes in and out. 2. Lung external environment. Lung ventilation and respiratory movement. 3. Renal corpuscle. Renal tubule. Renal corpuscle. Glomerular. Renal vesicle. 4. Dilation and contraction of respiratory movement. 5. Carbon dioxide diffusion in blood tissue cells. 6

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1. In the quadrilateral ABCD, ad ∥ BC, ad = 24cm, BC = 26cm, the moving point P starts from point a and moves to point d at the speed of 1cm / s along the edge of AD, and the moving point Q starts from point C and moves to point B at the speed of 3cm / S along the edge of CB. P and Q start from a and C at the same time. When one point reaches the end point, the other point stops moving with it. Let the motion time be T seconds, what are the values of T respectively, then the quadrilateral PQCD and the quadrilateral pqcb are parallelograms?
2. How to prove the limit of n-th root of n is 1 by definition
3. As shown in the figure, in the diamond ABCD, ∠ ADC = 120 °, then BD: AC equals () A. 3：2B. 3：3C. 1：2D. 3：1
4. The children in the big class of kindergarten made 32 flowers, among which the red flower was three times as much as the yellow flower. How much did the children make the red flower and the yellow flower
5. The perimeter of the rectangle is 19.4 meters. The length is 0.8 meters less than twice the width. How many meters are the length and width of the rectangle?
6. It takes 26 seconds for a train to pass the 396 meter bridge and 18 seconds to pass the 252 meter tunnel. How long is the train's body?
7. Find the following periodic functions 1. Y = sin3x / 4, X ∈ R 2. Y = cos4x, X ∈ R
8. Find the period of the following functions: (1) y = sin23x, X ∈ R; (2) y = 12cos4x, X ∈ R
9. The function with period 2 is () A. y=2cos2πx-1B. y=sin2πx+cosπxC. y=tan（π2x+π3）D. y=sinπxcosπx
10. Finding the minimum positive period of function {process} FX=sin{2x+PI/6}+sin{2x-pi/6}+cos2x
11. The top and bottom of a right angled trapezoid is 3cm. If you extend its top and bottom by 5cm, it will become a square. The area of this trapezoid is () square%
12. One eighth (x-1) ^ 5 = A0 + a1x + a2x ^ 2 + +a5x^5 Find the A0 power of 3, A1 power of 27, A2 power of 3, A3 power of 27, A4 power of 3, A5 power of 27 There's 1 / 8 in front of us. That's why we can't count... Depressed~
13. If a commodity is sold at a 10% discount, it will make a profit of 20 yuan. If it is sold at a 70% discount, it will lose 10 yuan Yuan, then the purchase price and price of the commodity are
14. The more the better, the good can add points As long as the ordinary fraction or decimal calculation and application, do not judge the choice, application to write out the process
15. A washing machine now sells for 204 kg, which is 21% cheaper than the original price. How much is the original price? Use the equation. Thank you
16. 1. A cuboid, 4 decimeters long, 0.4 decimeters more than wide, the same height and width, its volume is * * cubic decimeters 2. The 6060 bricks, 20 cm long, 10 cm wide and 5 cm high, are neatly stacked together. The volume of this pile of bricks is * * M & sup3
17. The original price of a kind of TV set is 2500 yuan, and the sales promotion in the market is 1 / 5. After the activity, the price is increased by 1 / 5. How much is the current price of this kind of TV set?
18. Mathematics problems of grade nine (quadratic function) How to judge a + B + C A-B + C 8A + 6B + 2C is not greater than 0
19. There are 62 basketball, football and volleyball, of which three fifths are basketball and two thirds are volleyball and 24 are football. How many are basketball and volleyball
20. What's the answer to the second question on page 68 of volume two of grade four? There is a square flower bed in Dongshan primary school. When the campus was built, the opposite sides of the flower bed were increased by 3 meters each. In this way, the flower bed became a rectangle, with an area of 24 square meters more than the original. How many square meters was the original flower bed My answer was 64, but the child came back and said that the teacher's answer was 16. The teacher made an article on "a group of opposite sides" and "each side". That is to say, the two ends of the original square were extended by 3 meters. The calculation result was 16 square meters. Our parents didn't know which answer was right