gnczp2010-02-16 11:18:01 +0000 #2

Jingmen City, Hubei Province in 2009 graduates of junior high school academic exams

math

Note:

1. Responses before, candidates must be his name, fill in the Admission Form Questions volumes and answer cards, admission ticket and bar code number on the card affixed to answer the specified location.

2.每小题multiple-choice answers selected, use 2B pencil to answer the answer on the card correspond to the subject label blacked out, and if changes, with a clean eraser, after re-elect James other answers. A. In the papers invalid.

3. Fill-in answer of reconciliation with 0.5 mm black ink pen A in the answer sheet corresponding to answer every question within the region. A. In the papers invalid.

4. Examinations end, I request that this Question be handed over volumes and answer cards.

Entry by Note: The Jingmen City in 2009 to take the exam online marking.

1, multiple-choice questions (in this a big issue a total of 10 small title,每小题there is only one correct answer,每小题three points, a total of 30 points)

1. .- 9. Is the square root of ()

(A) 81. (B) ± 3. (C) 3. (D) -3.

2. Calculated result is ()

(A) a. (B) b. (C) 1. (D)-b.

3. Figure, Rt △ ABC in, ∠ ACB = 90 °, ∠ A = 50 °, to collapse, so that point A falls on the CB side of A 'Department, the crease for the CD, then ∠ A'DB = ()

(A) 40 °. (B) 30 °. (C) 20 °. (D) 10 °.

4. From only with four red balls bag random order to work out a ball, if the ball touched the probability of white-p1, touch the red ball is the probability of p2, then ()

(A) p1 = 1, p2 = 1. (B) p1 = 0, p2 = 1. (C) p1 = 0, p2 =. (D) p1 = p2 =.

5. If = (x + y) 2, then the x-y value of ()

(A) -1. (B) 1. (C) 2. (D) 3.

6. Isosceles trapezoid ABCD in, E, F, G, H respectively, the midpoint of each side, then the shape of quadrilateral EFGH is a ()

(A) parallelogram. (B) rectangle. (C) diamond. (D) square.

7. On the x equation ax2-(a +2) x +2 = 0 only one solution (the same solver a solution), then a value of ()

(A) a = 0. (B) a = 2. (C) a = 1. (D) a = 0 or a = 2.

8. Function y = ax +1 and y = ax2 + bx +1 (a ≠ 0) of the image may be ()

9. Rectangular main view and the left view, shown in the figure (unit: cm), then its vertical view of the area is ()

(A) 12cm2. (B) 8cm2. (C) 6cm2. (D) 4cm2.

10. If the Inequalities broken, then a range of values ()

(A) a> -1. (B) a ≥ -1. (C) a ≤ 1. (D) a <1.

Second, fill-in (the big issue a total of eight small title,每小题three points, a total of 24 points)

11. =______.

12. The definition of a ※ b = a2-b, then (1 ※ 2) ※ 3 =______.

13. Shifting the point P to the left 2 units, and then pan up a unit to be P '(-1,3), then the coordinates of point P is ______.

14. Function y = (x-2) (3-x) to obtain the maximum time, x =______.

15. Figure, Rt △ ABC in, ∠ C = 90 °, AC = 6, BC = 8. Then △ ABC of the inscribed circle radius r =______.

16. From each of the four cards marked with 1,2,3,4, the time at the same time pumping 2, which is odd, and the probability is ______.

17. A straight line y = ax (a> 0) with the hyperbola y = cross in A (x1, y1), B (x2, y2) 2:00, then 4x1y2-3x2y1 =______.

18. Figure, a square ABCD of side length 1, the fixed point P from the A point of view, according to counter-clockwise along a square side movement, when it is the movement distance of 2009, the point P location of ______; location when the point P for the D point, the point of the movement distance of ______( P containing the statement holds that a natural number n).

3, to answer questions (in this a big issue a total of seven small title, full score 66 points)

19. (This question perfect score 6 points) are known to x = 2 +, y = 2 -, calculation of algebraic value.

20. (This question perfect score 8 points) shown in the □ ABCD in, ∠ BAD for the obtuse angle, and AE ⊥ BC, AF ⊥ CD.

(1) confirmation: A, E, C, F 4:00 a total of circle;

(2) Let line segment BD and (1) circular cross-Yu M, N. Verify: BM = ND.

21. (This question out of 10 points) Sunday, Siu-ming and seven students a total of eight people going on an outing, the way, he would spend 20 yuan to buy drinks, cola and tea shops is only known to 2 yuan a cup of Coke, a cup of tea 3 yuan, if the run out of money just 20 yuan.

(1) there are several ways to buy? Each method the number of cups of Coke and milk?

(2) each of at least a drink and at least two cups of tea, there are several ways to buy?

22. (This question out of 10) a school student cadre school student advocacy of "disabled" voluntary contributions to the activities of a sample survey, get a group of students contributions of data, the next figure is based on this set of data drawn charts, diagrams from left height of each rectangle to the right ratio of 3:4:5:8:2, but also know that in the survey to donate 15 yuan and 20 yuan a total of 39.

(1) they had taken the total number of people? Contributions to the probability of not less than 20 yuan How much?

(2) This set of data mode, the median of all what is?

(3) If the school a total of 2310 students, please estimate the number of students in the school contributed a total of dollars?

23. (This question out of 10 points) in Figure radius of 2 ⊙ O perpendicular to each other within the two strings AB, CD intersect at P-point.

(1) confirmation: PA • PB = PC • PD;

(2) mid-point of BC-based F, cross-linked FP and extended the AD at E, verify: EF ⊥ AD:

(3) If AB = 8, CD = 6, seeking a long OP.

24. (This question out of 10 points) a function y = kx + b of the image with the x, y axes cross at point A (2,0), B (0,4).

(A) Find the function of the analytic style;

(2) O for the coordinates of the origin, let OA, AB respectively, the midpoint of C, D, P for the OB on a fixed point, seeking the minimum value of PC + PD, and seek to obtain the minimum values of the coordinates of P points.

25. (This question full score 12 points) a parabola opening upward with the x-axis cross at the A (m-2, 0), B (m +2,0) 2:00, note the parabola vertex to C, and AC ⊥ BC.

(1) If m is a constant, find the analytic parabolic type;

(2) If m is less than 0 a constant, then (1) how kind of parabola through the vertex of the translation can make the origin of the coordinates?

(3) Let the parabola y-axis is cross-axle at the D point and asked whether there is a real number m, making △ BCD is isosceles triangle? If it exists, find the value of m; if not exist, please describe the reasons.

Jingmen City, Hubei Province in 2009 examination paper

junior high school graduates in mathematics Questions Answers and Grading Standards

Note: In addition to the answer given to this solution, the solution of any other right, according to the steps corresponding to the sub.

1, multiple-choice questions (in this a big issue a total of 10 small title,每小题there is only one correct answer,每小题three points, a total of 30 minutes)

title No. 12,345,678,910

answer BBDBCCDCAA

Second, fill-in (the big issue a total of eight small title,每小题three points, a total of 24 points)

11. ; 12. -2; 13. (1,2); 14. ; 15.2; 16. ; 17. -3; 18. Point B; 4n +3 (entry by Note: The filling 4n-1 (n is a positive integer) is more appropriate)

3, to answer questions (in this a big issue a total of seven small title, full score 66 points)

19. Solution: =

= = ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 4 points

when x = 2 +, y = 2 - when =- 4 ... ... ... ... ... ... ... ... ... ... 6 points to 20. Solution: ∵ AE ⊥ BC, AF ⊥ CD, ∴ ∠ AEC = ∠ AFC = 90 °.

∴ ∠ AEC + ∠ AFC = 180 °. ∴ A, E, C, F 4:00 of round; ... ... ... ... ... ... ... ... ... ... ... ... ... 4

(2) from (1), we can see the circle diameter is AC, set up AC, BD intersect at point O,

∵ ABCD is a parallelogram, ∴ O as a center of the circle.

∴ OM = ON. ∴ BM = DN. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 8 points to 21. Solution: (1) Let to buy cola, tea, respectively x, y cup, according to meaning of the questions were

2x +3 y = 20 (and x, y are natural numbers) ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 2 points

∴ x = ≥ 0 solution was y ≤

∴ y = 0,1,2,3,4,5,6. Substitution 2x +3 y = 20 and test may

... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 6 pm

so there are four ways to buy each method the number of cola and tea cups were as follows: (can also be obtained by directly identifiable)

10,0; 7,2; 4,4; 1,6. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 7 points

(2) According to the meaning of the questions: At least one drink per person and at least two cups of tea, that is y ≥ 2 and x + y ≥ 8

by (1) we can see, there are two ways to buy. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 10 points to 22. Solution: (1) Let the number of people to donate 15 yuan for the 5x, then the meaning of the questions to donate 20 yuan according to the number of 8x.

∴ 5x +8 x = 39, ∴ x = 3

∴ investigated a total of 3x +4 x +5 x +8 x +2 x = 66 (people) ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 3

∴ contributions to a number not less than 20 dollars the probability is. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 5 points

(2) from (1), we can see, this set of data mode is 20 (million), the median is 15 (Yuan ). ... ... ... ... ... ... ... ... ... ... ... 7 points

(3) all students contributed a total of

(9 × 5 +12 × 10 +15 × 15 +24 × 20 +6 × 30) ÷ 66 × 2310 = 36750 (yuan) ... ... ... ... ... ... ... 10 points to 23. (1) ∵ ∠ A, ∠ C are on the same arc, ∴ ∠ A = ∠ C.

∴ Rt △ APD ∽ Rt △ CPB, ∴, ∴ PA • PB = PC • PD; ... ... ... ... ... ... ... ... ... 3 points

(2) ∵ F of BC's mid-point, △ BPC for the Rt △, ∴ FP = FC, ∴ ∠ C = ∠ CPF.

Also ∠ C = ∠ A, ∠ DPE = ∠ CPF, ∴ ∠ A = ∠ DPE. ∵ ∠ A + ∠ D = 90 °,

∴ ∠ DPE + ∠ D = 90 °. ∴ EF ⊥ AD. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 7 points

(3) for OM ⊥ AB Yu M, ON ⊥ CD in N, with the vertical diameter theorem:

∴ OM2 = ( 2) 2-42 = 4, ON2 = (2) 2-32 = 11

it is also easily permit quadrilateral MONP be rectangular,

∴ OP = ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 7 points to 24. Solution: (1) to point A, B coordinates substitution y = kx + b and the calculated k =- 2, b = 4.

∴ analytical formula: y =- 2x +4; ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 5 points

(2) Let point C on the point of symmetry O point C ', links to PC', DC ', then PC = PC'.

∴ PC + PD = PC '+ PD ≥ C'D, namely, C', P, D total lane, PC + PD is the minimum C'D.

Link CD, the Rt △ DCC 'in, C'D = = 2;

easy to get the coordinates of point P is (0,1). ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 10 points

(Rt △ AOB can be made on the y-axis symmetric △)

25. Solution: (1) Let the parabolic analytic formula: y = a (x-m +2) (x-m-2) = a (x-m) 2-4a. ... ... ... ... 2 points

∵ AC ⊥ BC, we can see from the symmetry of a parabola: △ ACB is isosceles right triangle, then AB = 4,

∴ C (m, -2) on behalf of Entering a =. ∴ analytical formula: y = (x-m) 2-2. ... ... ... ... ... ... ... ... ... ... 5 points

(also seeking C points, set vertex type)

(2) ∵ m is less than zero constant, ∴ simply a parabola to the right pan-m units, and then pan up 2 units, can make a parabola y = (x-m) 2-2 vertex in the coordinate origin. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 7 points

(3) from (1) were D (0, m2-2), is located there is a real number m, allows for the isosceles triangle △ BOD.

∵ △ BOD as a right-angled triangle, ∴ only OD = OB. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 9 am

∴ m2-2 =. m +2., When the m +2> 0, the solution was m = 4 or m =- 2 (homes).

When the m +2 <0, the solution was m = 0 (homes), or m =- 2 (homes);

when m +2 = 0, ie, m =- 2 Shi, B, O, D 3:00 overlapping (sub-meaning of the questions , rounded)

In conclusion: there is a real number m = 4, allows for the isosceles triangle △ BOD. ... ... ... ... ... ... ... ... ... ... ... 12 points

Jingmen City, Hubei Province, middle-school graduates in 2009 school examination papers

physical

this paper were 10 pages, perfect score of 60 points, examination time is 60 minutes.

Note:

1. Answer the former, the candidate must be his name, fill in the admission ticket number and answer examination questions on the card volume will be admission ticket bar code affixed to the specified location on the answer sheet, and carefully approved the barcode on the name, admission ticket number is correct.

2.每小题selected multiple-choice answers with a 2B pencil to answer the answer on the card correspond to the subject label blacked out. For a change, with a clean eraser again afterOther answers to the election Tu label. The answer written examination questions on the volume is invalid.

3. The non-multiple-choice questions with 0.5 mm black pen to write the answers in the answer sheet corresponding to answer every question within the region, written answers to examination questions on the volume is invalid.

4. Examinations end, I request that this Question be handed over volumes and answer cards.

Choice of 6 small title,每小题2 points, a total of 12 points.

1, multiple-choice (in this title has six small title,每小题2 points, a total of 12 points.每小题of the four options, only one option to meet the meaning of the questions, please comply with the option to label graffiti meaning of the questions In the answer card.)

1. study and practice the scientific concept of development, sustainable development concept should be implemented in all work. The following is not consistent with the requirements of sustainable development is a

A. If possible, travel to make use of bicycles

B. vigorous development and utilization of solar and wind energy

C. conserve water, electricity, gas

D. vigorously develop coal as fuel coal-fired power

2. Magic Show "will be dancing flames" program, the first in the platform, lit a candle, and then holding candles placed near the side snare drum, drum heads face the candle. When he sounded the snare drum, drum dancing with the candle on. This phenomenon shows

A. There is a mysterious force Magic

B. drum heads vibration of sound, sound waves can transmit energy of

C. The drum is a drum heads hear the vibration of the ultrasonic vibration of the drum heads

D. waves

3. The following are a number of statements on the optical phenomenon in which the right is

A. on shore to see fish in the water than its actual location is lower

B. oblique insertion of the glass filled with water the chopsticks, looking like the water at break, which is the phenomenon of light reflection

C. see objects into the virtual image, there was no light injected into our eyes

D. pinhole imaging illustrates the spread of light along a straight line

4. the following information about life Common thermal phenomena are explained, the error is

A. in the mountains on the boil, the temperature was less than 90 ℃ water is boiling, and because the boiling point of water with the pressure on hot days, when

B., dogs often put their tongues exports, in fact is the use of evaporative cooling

C. closet moth's mothball getting smaller and smaller, which is the phenomenon of vaporization

D. In winter, the frozen wet clothes to dry is a distillation of the phenomenon of direct 5. by different substances a, b, c composed of three solid body, their quality and size relationships shown in Figure 1,

Aa from the figure we can see the highest density of substance

Bc the highest density of substance

Cb material density is 2 × 103kg/m3

D. inadequate, one can not judge

6. shown in Figure 2, A be suspended from the spring under the iron, B is the solenoid core, S is a switch (S then 1:00 into the circuit coils connected the number of multi-, S then 2:00 into the circuit of coil turns even less), P is a sliding rheostat of the vane. For spring the length of the variable-length can be taken approach is to

A. Vane P does not change the position, S received from a change 2

B. S then a constant, P will be the right sliding vane

C. S then a constant, P will be left sliding vane

D. S then a constant, P vane position remains unchanged, the core B three out of

the non-multiple choice questions, a total of 48 points.

2, fill in the blank with the mapping (the big question has 7 small problems, fill-in of each air an am, mapping a sub-title for each figure, a total of 20 points)

7. The study of nanotechnology in China has the world advanced level, nanometer in fact __ ▲ __ units; Figure 3 is that many students are using the "small flashlight", it does not need a small incandescent light bulb, while the use by the semiconductor material with a one-way electrical properties of the components, such components The name is called _ _ ▲ __; modern city pay more attention to environmental protection, and often set the noise level in the main streets of monitoring devices, when a car passed, this device will display the value of _ _ ▲ __ (optional "larger", " smaller "or" no change ")

8. If you do not have good habits with the eyes, easy to make the eye myopic. Nearsighted to see distant objects unclear from the convergence of the distance a point of light in the retina __ ▲ __ (optional "before" or "after"). The correction method is equipped with a __ ▲ _ lens.

9. "Small Dragon Boat Festival holiday," Mom brought Xiaofang to Wudang Mountain Tourism. When they ride the cable car slow and uniform increase in time (Figure 4), Xiao-fang gravitational potential energy __ ▲ __, kinetic energy __ ▲ __, mechanical __ ▲ __ (3 space are optional, "increase", "reduce "or" no change ").

10. As shown in Figure 5 will be a thin metal tube fixed to the desktop, the tube inside to put some ether, the tube mouth plugged with the stopper. Take a few laps around the rope in the cylinder outside and quickly pull back and forth, you'll see plug jumped off the tube mouth. This phenomenon shows __ ▲ _ energy and internal energy can be transformed into each other, __ ▲ _ can change the object internal energy; to change the way an object can have within a __ ▲ _.

11. Use "stroboscopic photography" to record objects in a different location in the same time interval, as shown in Figure 11 is A, B and two tennis when the stroboscopic photographs. A location away from the adjacent two are equal, we can see from the photos, _ _ ▲ _ the ball to do uniform linear motion, _ ▲ _ increasing the speed of the ball (all optional "A" or "B").

12. Xiaojuan in the inquiry, "resistor with the voltage across the current relationship", it will record and collate the experimental data plotted as shown in Figure 7 the relationship between IU images. A map available from the resistance of _ ▲ Ω, A, B, after two resistors in series the total resistance is _ ▲ Ω; of these two resistors connected in series after the power supply voltage of 9V, the circuit current ▲ A; The two resistors in parallel connected to the 9V power supply, the distributors of the current _ ▲ A.

13. Please complete the following mapping as required (must be the answer card, mapping, can be the first to use a pencil mapping, but the ultimate answer cards Chart 0.5 mm pen must be painted black)

(1) Figure 8 A said that football in the air, draw a schematic of gravity that it suffered.

(2) bicycle taillights structure shown in Figure 8 B, at night, when a light shines on taillight warning when you can play a significant role. Try to draw a diagram of light reflected light (to retain the necessary support line).

(3) In the family shown in Figure 8, C circuit, in order to stroke line instead of wire, will be a button to switch the energy-saving lamps with access to the circuit.

3, experiment and explore (the big question has 4 small questions, 1 point for every space, a total of 16 points)

14. Xiaohua through the experimental apparatus as shown in Figure 9 to explore "boiling water" . Experiment to two glasses of water to be heated for some time, observed that, while continuing to heat, but a thermometer showing the rise in the number of its readings are ▲ ℃. This shows that the ▲.

15. Li Yun and Zhang Fang co-inquiry "imaging lens laws" (Figure 10, object distance with u that the focal length indicated by f). When u> 2f, the Guang Ping get a clear, inverted, reduced ▲ like (optional "virtual" or "real"); If you want to get a clear and magnified real image, candles should ▲ direction of lens movement, while light ▲ screen should be the direction of lens movement (two air are optional "get away" or "close"); if no matter how mobile Guangping do not have the candle-like, indicating u ▲ f (optional ">","= "or "<")。

16. A small experimental group of four pairs of students would like to explore the inter-class desktop and textbooks, the size of sliding friction and pressure relationship.

(1) a student textbook on the physical level of the desktop, through the spring dynamometer pull the level of uniform textbooks, this time the show spring dynamometer number is 2N, textbooks, and the friction between the desktop size ▲ N.

(2) In the original textbook, then put another student the same textbooks in order to change the textbooks and the pressure between the desktop, this approach ▲ (optional "feasible" or "not feasible").

(3) through multiple experiments, they obtained the experimental data shown in the following table:

analysis of the data in tables can be concluded that: textbooks and the greater the pressure between the desktop, sliding friction between them ▲.

17. Siu-ming and a small light to explore "the relationship between the parallel circuit voltage", Xiao-Ming press circuit connected as shown in Figure 11 A 11 B of the physical mapping diagram (voltage table has not yet connected)

(1) Small bright one on the saw Xiao-Ming connection errors, and pointed out that the switch will occur if they are directly closed ▲ (optional "open" or "short") phenomenon, a small light bulb L1, L2 are not bright, but also may result in damage to a rheostat or ▲.

(2) Small light change only with the L1, L2 of the four terminal A, B, C, D attached to one end of a root wire on the circuit connected correct. His approach may be ▲ (that of a can)

(3) Next, they are shown in Figure 11 C circuit connected to the three voltmeter. During the experiments, by adjusting the sliding rheostat so that the number of voltmeter V1 of the show as shown in Figure 12, then the voltage is shown in Table V, the number of yes ▲ V, if the L2 marked "2.5V, 1W" word, this time the current through L2 yes ▲ A.

(4) They slide rheostat in the circuit in series is the role of ▲, closed switch before the rheostat of the vane should be placed ▲ P-side (optional "left" or "right")

4, application and innovation (the big question has two small problems,每小题6 points, a total of 12 points. to write the necessary text description and calculation process to calculate the results of write unit.)

18. "Wuhan number" guided missile destroyer in Asia at the leading level, to participate in The first batch of China's navy went to the Gulf of Aden, the Somali waters escort mission. "Wuhan number" of the displacement of 7000t, is a kind of air defense, anti-submarine, anti-ship capabilities balanced ocean-going destroyers. (Seawater density of 1.03 × 103kg/m3, g take 10N/kg)

(1) fully loaded, the "Wuhan number" by the extent of the buoyancy?

(2) If the ship at the end of the depth of the sea somewhere, away from the 8m, then there is much pressure by the sea?

(3) "Wuhan No." In the cruise, through ship-based radar target. If the radar electromagnetic waves sent by the 2 × 10-4s received echo, the target distance from the number of warships?

19. In response to the growing shortage of the oil crisis, the world is pressing ahead with new energy vehicle development and production. China has independently developed the "East Light" brand hybrid electric vehicle (with internal combustion engine, electric motor two kinds of power plants), each power plant's rated power is 50kW, charging time can be stored power 100kW • h.

(1) If the vehicle powered only by electric motors, each charge can be the number of normal working h?

(2) of the current vehicle ethanol gasoline calorific value of approximately 4.0 × 107J/kg, motor cars and consumed on a single charge of electricity, equivalent to the amount of savings kg petrol?

(3) If the vehicle power unit of the mechanical efficiency of 75%, it has done useful work normal working 1min What is J?

Hubei Jingmen city junior high school graduates in 2009 school exam

Physical Questions Answers and Grading Note

1, multiple-choice (in this title has six small title,每小题2 points, a total of 12 points)

title No. 1 23456

The answer DBDCAC

2, fill in the blank with the mapping (the big question has 7 small problem, fill in the blank space for every 1 minute, mapping points per Figure 1, a total of 20 points)

7. length; light-emitting diodes ( or diode); larger

8. the former; Au

9. increase; unchanged; increased

10. mechanical (or moving); doing work; heat transfer

11. A; B

12.10; 15; 0.6 ; 2.7

13. Figure A 1

Rating: (1) A diagram of the role of the point of force is not in football terms, does not indicate the direction of force, there is no standard name of the force can not score.

(2) B only need to draw a diagram of light reflected light; only a reflection of light can not draw points; the 2nd reflected light with the first line should be parallel to a second incident light.

(3) C picture wrong and that is not scoring

3, experiment and explore (the big question has 4 small questions, 1 point for every space, a total of 16 points)

14.97; water boiling when the temperature is kept constant (or the boiling point of water is 97 ℃, boiling water, to keep the process of absorption of heat, other answer is reasonable and can score)

15. really; around; away; "(or =)

16 . (1) 2; (2) feasible; (3) the larger

17. (1) short circuit; power supply; (2) one end of the wire ① change from the terminal C receives D (B) (or wire ② A change from one end of the terminal received a B (D)); (3) 2.5; 0.4; (4) to change the layout of the current (or change the voltage across a small light bulb); the left

4, application and innovation (the big question has two small problems,每小题6 points, a total of 12 points. to write the necessary text description and calculation process to calculate the results of write unit.)

18. (1) (1 point)

(1 point)

(2) (1 point)

(1 point)

(3) (1 point)

(1 point)

19. (1) from, available (1 point)

(1 point)

(2) consumption of on a single charge of the energy savings of gasoline quality (1 point)

(1 point)

(3) from, available (1 point)

(1 point)

score description: No formula or formula references, errors can not be derived score, the formula the correct calculation is incorrect, but only half of the points, there is no need to write deduction of half the units.