1. Fill in the blanks: (2 points for each small question, * * * 20 points)
1, when the value of the algebraic expression is 7.
2. The solution set of inequality group is.
3. As shown in the right figure, ∠ A = 30, ∠ BCD = 68, then ∠B=.
This is a one-dimensional linear inequality.
5. The positive integer solution of binary linear equation is
The positive integer solution of 6 is.
7. The circumference of a rectangle is 24, the length ratio is 1, the length is, the width is, and the binary linear equations are.
8. If a commodity is marked as 220 yuan after the purchase price is increased, in order to attract customers, it can still make a profit of 10% if it is sold at a 10% discount (that is, the selling price is 90% of the marked price).
The purchase price of this commodity is RMB.
9. As shown on the right, in △ABC, the bisector of ∠B and ∠C intersects with point O,
If ∠ A = 50, ∠BOC=.
10, and the solution set of inequality is, then the value of is.
Second, multiple-choice questions: (3 points for each small question, *** 18 points)
1 1, which belongs to the linear equation in the following categories is ().
(A) (B) (C) (D)
12, the following deformation is correct ()
(a) If, then (b) If, then
(c), then (d) If, then
13, as shown on the right, at △ABC, AB=8, AC=6,
AD is the center line of △ABC, then △ABD and △ADC
The difference in perimeter is ().
14 (B) 1 (C) 2 (D) 7
14. If the value of is non-negative, the value range of is ().
(A) (B) (C) (D)
15, equation and, the value is ()
5 (B) 6 (C) 7 (D) 8
16. If the solution set of the inequality group has no solution, the value range of is ().
(A) (B) (C) (D)
Third, solve the following equations (groups) and inequalities: (5 points for each small question, ***20 points)
17, solving equations: (1) (2) solving inequalities:
18, solving the equation
19, solving inequalities
And the solution set is expressed on the number axis.
Four, drawing questions: (5 points)
20. Known: As shown on the right, in △ABC,
Found: (1) the centerline on the side of AB.
(2) the height on the side of 2)AB
V. Answering questions:
2 1, known, when,; When. (7 points)
(1) Find the value of b, (2) When, the value of.
22. What is the value of m, and the solution of the equation is positive? (7 points)
23. Enumerate binary linear equations to solve application problems: Arbor Day is coming. Forty-five students in the class divided into two groups to plant trees. Group A is required to dig only five pits and not plant trees, while Group B is required to dig three pits and plant seven trees. How to allocate two groups of people so that the number of pits dug is exactly equal to the number of trees planted? (7 points)
24. A middle school held a math contest, in which four people won the first prize, six people won the second prize and twenty people won the third prize. The school decided to award prizes to the winning students. The prizes in the same order are the same, and only one of the items listed in the following table can be selected:
Name football volleyball badminton racket pencil case photo album compass notebook ballpoint pen
Unit price (RMB) 32 20 16 10 8 5 4 3 2
(1) If the higher the prize order, the higher the unit price of the prize, then how much should the school spend on the prize at least?
(2) If the unit price of the first prize is required to be twice that of the second prize, and the unit price of the second prize is twice that of the third prize, what are the purchase methods on the premise that the total cost does not exceed that of 200 yuan? How much is the most expensive one? (***9 points)
25. In figure ① below, there is a pentagonal ABCDE.
( 1) Q ∠ 1=∠B+∠D？ Please explain the reason.
(2) Can you explain ∠ A+∠ B+∠ C+∠ D+∠ E = 180?
(3) Is the conclusion in the above question (2) still valid in Figure ②? Please provide a justification for the answer. (7 points)
Common phrases in junior middle school English
1. There are nearly 500 phrases in junior high school English textbooks, some of which are commonly used and need to be mastered skillfully.
2. In learning, pay attention to the accumulation of phrases, especially prepositional phrases and phrasal verbs.
The meaning of fixed phrases must not be literal. For example, the verb look is willing to be "look", but look after means "care", look up (a word in a
Look up (a word) in the dictionary.
4. Pay great attention to the use of articles in fixed phrases. Sometimes articles can cause changes in meaning. For example, go to school means "go go the school".
School means "going to school"; To happen means to "happen" and accept.
Place means "replacement". Some phrases must use articles, while others are not. Like at night, at night.
Verb phrases (including phrasal verbs), prepositional phrases and other phrases.
(A) phrases composed of be
Come back/come in/go out Come back/stay at home/go out.
At home/at home/at work
Be good at
Watch out, watch out, watch out
Be covered with
6) Get ready ...
Be surprised at ... ...
Be interested in ... ...
Born.
On, on, on.
Be able to do sth.
Be afraid (of doing sth). Then ...) I'm afraid ... (I dare not do it, I'm afraid ...)
Be angry with sb. Be angry with (sb.)
Be happy (satisfied) with ... ...
Be famous for … ...
Be strict with work and people.
Where are you from ... where are you from?
Hungry/tired/hungry/tired
Worry, worry
Something worth doing. ...
Be covered with ... ...
Need it (very much).
23) get into trouble.
Be glad to do sth. My pleasure ...
be late ...
Made of ... ...
Be satisfied with ... ...
28) Freedom, freedom
be sick abed
Be busy doing sth ... (be busy ...)
(2) phrases composed of verbs such as come, do, get, give, go, have, help, keep, make, looke, put, set, send, take, turn and play.
1) come back
2) come down
Come in, come in
Come on, let's go. Come with me.
5) Come out
Come out of ... ...
7) Come up
8) from ...
Do your homework/homework
10) Do more speaking/reading and do more speaking practice/reading.
Do your best.
12) Shopping (cooking, reading and cleaning) Shopping (cooking, reading and cleaning).
Do a good deed
do morning exercises
15) do eye exercises.
Well done, well done. ...
Get up
18) get everything ready.
Get ready for ... ...
Get along well with ...
2 1) get the return.
22) get rid of
23) Get on the bus and collect money
Get on/off/get on/off
25) Arrive
26) get there
Give it to sb. make a telephone call ...
Make a report
Give a lecture (piano concert)
30) send it back, send it back
Give some advice to ...
Give a lesson to ... ...
Give in to
34) Give up
Give it to sb. Give a chance ... a chance.
Give a message to.
Go, go, go, go.
38) Go to the cinema to see a movie
Go to bed (make the bed)
40) Go to school (university) Go to school (university)
4 1) Go to the hospital.
Walk past it, look back/walk past. ...
Go fishing/skating/swimming/shopping Go fishing/skating/swimming/shopping.
Go home (there) Go home (there)
45) detour, detour.
Go up
47) Go out for a walk
Keep doing it, keep doing it ...)
Go on with sb's work.
Go upstairs/downstairs.
The light went out.
Class/meeting.
Hold a football (basketball) match. Hold a football (basketball) match.
54) Listen to dictation
give it a try
Have a good time.
Listen to a lecture (piano concert)
Listen to a report on ... ...
Drink a glass of water (a cup of tea) drink a glass of water (a cup of tea).
Have breakfast/lunch/dinner.
6 1) Have a meal (three meals).
62) Eat and eat
Have bread and milk for breakfast.
headache
fever
Cough (cold) Cough (cold)
take a look ...
Take a break (at work or at rest).
Talk about
Swimming/Walking Swimming/Walking
7 1) Have physical exercise.
72) Hold a sports meeting (meeting) Hold a sports meeting.
Ask someone (please) to do sth. ...
Conduct a test/exam/exam
75) Have an idea.
It's better to do something. Don't do sth. It's best to do this ... (It's best not to do it ...)
Have a word with ... ...
Help sb. Use sth. Help sb. Do sth. Help ... help ... do ... in ...
Please help yourself to some chicken/fish/meat.
80) Help each other.
8 1) keep up and not fall behind. ...
Keep silent.
Keep sb. Do sth. Make ... do it all the time ...
keep a diary
Make noise (loud noise, loud noise, loud noise).
Make a living
Make sb. Do sth. Force sb. Do sth.
Make faces, make faces.
Make friends with ... ...
Make mistakes, make mistakes.
Make room for ... ...
Make sentences with … ...
93) Make a fire.
Made of ... ...
95) Made in ...
Be careful (outside)
Look up a word in the dictionary.
98) look up
Take care of, look after, look after
100) looking for discovery
10 1) looks alike.
102) looks fine/fine/tired/worried. Looks fine/healthy/tired/worried.
Watch out, watch out, watch out.
65438+ ... like ... entertaining ... like. ...
105) look around, look around.
106) have a look ...
Put on (clothes), put on (hat), put on (a play)
108) put it up to build, put it up, hang it up, lift it up, and stick it up.
109) entry, input
Put your heart and soul into it
1 1 1) put it down ... put it down. ...
1 12) input.
1 13) setup and erection.
1 14) set out, set out.
1 15) set off
1 16) Set an example. ...
Please call someone (call)
1 18)
1 19)end up send, start.
Take sb.' s advice
12 1) Take it out, take it out.
122) win if you win.
123).
Sit in sb's place.
Instead of ...
Take a walk/rest. Take a walk/rest
127) relax.
Take sth away. Take it.
Take sb. Take sb. to the park/London for a holiday.
130) take care of it.
Take a look (for the last time).
132) to take the exam
133) to take away
134) take it back, take it back.
Hold on, hold on ...
136) Take off (clothes, hats, shoes, etc.). ).
Take an active part in (an activity)
138) Take photos.
139) Take some medicine.
140) by bus/train, boat/bus, train/boat.
14 1) Turn on and off (lights, radios, etc. )
Turn off (lights, radios, etc.). )
143)
144) Turn ... into ... ...
145) turn to turn, turn
Turn down the volume.
147) Turn ... Flip ...
148) play basketball, football and volleyball.
149) play games, play games.
150) Play the piano (violin), play the piano (violin).
15 1) playing with snow
Make fun of ... ...
(3) Phrases composed of other verbs
153) think about it.
Arrive somewhere.
155) Eat up.
Do a good job in ... well done.
Enjoy doing sth. Enjoy doing sth. Enjoy doing sth.
158) find out, find out (the truth, etc.). )
Eat up, drink up.
Stop doing sth. Stop doing sth.
Stop to do sth.
162).
65438+
Come on, come on, come on
165) to enter the registration.
166) Langer is laughing.
167) for
168) is used to
169) wake up ... wake up.
170) to work out the calculation.
Secondly, verb phrases, prepositional phrases and other phrases.
1) to the request ...
2) Ask for leave
3) Send someone to ask (call)
4) payment ...
5) Wait and wait
thank ...
Apologize to sb. For something. Apologize to sb.
8) Looking for discovery
9) Leave ... In order to leave ... for. ...
10) fall
1 1) cold.
Catch up with
Agree with sb.
14) has been filled ... with filling. ...
Tell sb. About something.
Talk about talking about ...
17) consider it. ...
18) worried ...
Take care of
20) catch up, catch up.
2 1) after reading and reading the same ...
Smile at ... ...
Knock (on a door, window)
Make a hullabaloo about ... ...
throw away
Try to do sth. ...
Please?Line?Up?
28) Change ... into ... and become ...
29) Long live ... rush in.
30) meet ... by chance
3 1) Have you heard of it?
Think of, consider
33) Catch the caught object
34) instead ...
Hand in
be sick abed
Receive a letter from … ...
Immediately, immediately.
Finally
40) First, first.
At the age of 4 1) ... at the age of ... ...
At the end of ... at the end of ... ...
At first ... at first. ...
At the foot of ... At the foot of ... ...
45) Meanwhile
Evening/noon
With the help of sb.
With the help of ... with the help of ... ...
Smile
Saw it with my own eyes.
After a while.
From now on, from now on.
53) From then on.
54) For example
stay far away
56) From morning till night
soon after
By airmail
Send an ordinary letter by ordinary mail.
Right, right.
6 1) is by the window.
62) By the end of ... to the end of ... ...
Gradually
64) In short, it is always * * *
in fact
66) When a person is in his twenties.
In a hurry
In the middle of ... ...
Immediately, soon
Timely (punctual) timely
Publicly, openly
72) For ...
73) Front ...
74) In the sun, in the sun
Finally, finally
76) in surprise
77) In turn
Of course, of course.
One point is one point.
Lots and lots
On the way to someone. On the way. ...
82) Walk, walk
A report on space
On the other hand, on the other hand.
at weekends
On the left (right) is on the left (right) side
On the other side of … ...
88) By radio broadcast
Happily ... happy.
To sb's surprise. ...
Three, quantifier phrases and other phrases
(A) quantifier phrases
1) a little
Some (countable), some ...
3) A little (uncountable)
Lots and lots
5) Piece by piece (block, block)
A cup of tea
Cup by cup.
Piles (piles and piles) ...
9) Box by box
10) a copy.
1 1) Bowl by bowl
12) Basket by basket
13) a plate of a plate
14) bottle by bottle
15) One basin and one washbasin
16) one set.
17) one kind
The type in the type.
A large number (uncountable nouns)
A large number (countable nouns)
Many, many (countable nouns)
22) Different types and models
23) Team by team, team by team.
(2) Other phrases
1) various
2) The whole world/the whole country/the whole world.
3) all over every part, all.
4) a lifetime
5) One sequence after another
6) Children's Palace Children's Palace
7) Day after day, day after day
8) Up and down
9) The day after tomorrow
10) The day before yesterday
1 1) Last/past two years (or so) Last two years (or so).
12) nationwide/worldwide/worldwide.
13) Just now
Just/then just/then
15) Half an hour's journey.
16) Later.
Classification of junior high school English words by People's Education Press
Vehicle types: bus, car, boat, ship, taxi, plane, train, ribbon, jeep,
Cars, bicycles, sports cars, airplanes,
Country category: China, United States, Egypt, Brazil, South Korea, North Korea, Poland,
New Zealand, Japan, France, Britain, Canada, Australia, Argentina,
Netherlands, Vietnam, India, Italy, Greece, Mexico, Russia, Sweden,
Norway, Spain, Germany, Switzerland, Thailand, Greece, South Africa,
Body parts: head, feet, legs, teeth, hands, ears, eyes, nose, mouth, face,
Arms, back, neck, stomach, throat, heart, knees, fingers, toes, body,
Hair, beard, elbow,
Clothing: scarves, belts, sports shoes, wallets, earrings, hats, jeans, watches,
Straw hats, rings, skates, backpacks, ties, bags, pants, socks,
Dresses, coats, shirts, T-shirts, skirts, shorts, sweaters, shoes,
Uniforms, jackets, earrings, hair clips,
Category of places: clubs, restaurants, shops, supermarkets, museums, schools, libraries,
Hotels, auditoriums, swimming pools, post offices, banks, parks, zoos, markets,
Gardens, hospitals, TV stations, police stations, beaches, cinemas, churches,
Factories, farms, shops, theaters, aquariums, universities, restaurants,
Barber shops, gymnasiums, galleries, pharmacies, laboratories, shopping malls, squares,
Shops, video game halls,
Color classification: red, black, green, white, yellow, orange, brown, gray, pink,
Gold, blue, purple,
School supplies: pens, pencils, rulers, erasers, paper, pencil boxes, ink, notebooks,
Dictionary, pencil sharpener, schoolbag, backpack, textbook, flashcard,
Animals: sheep, horses, monkeys, dolphins, pandas, tigers, foxes, snakes, rabbits, lions,
Sharks, goats, dogs, cocks, hens, chickens, ducks, elephants, camels, birds, wolves,
Polar bears, giraffes, koalas, penguins, camels, seals, rabbits, octopus,
Kangaroos, parrots, turtles, ants, mice, spiders, hamsters, manatees, goldfish,
Chimpanzees, cheetahs,
Time: January, February, March, April, May, June, July, August, September,
October, November, December,
Spring, summer, autumn, winter
Sunday, Monday, Tuesday, Wednesday, Thursday, Friday and Saturday.
Morning, afternoon, noon, night, night, seconds, minutes, hours, days, weeks,
Month, year, century
Occupation: doctor, nurse, veterinarian, policeman, policewoman, engineer, worker,
Farmers, journalists, teachers, inventors, scientists, drivers, principals,
Athletes, singers, dancers, actors, actresses, tour guides, waiters and waitresses,
Assistant, boss, businessman, psychologist, writer, writer,
Photographers, musicians, tour guides, violinists, pianists, coaches, staff,
Sales assistant, chef, dentist, director, optometrist, translator,
Vegetarian, athlete, class teacher, master, pilot, chef,
Fisherman, lawyer, sailor, tutor, collector,
Football: basketball, volleyball, football, soccer, table tennis, tennis,
Baseball, badminton, ice hockey, golf,
Vegetables: carrots, tomatoes, cabbages, onions, potatoes, green peppers, mushrooms,
Broccoli, pumpkin, lettuce,
Fruit: apples, oranges, bananas, pears, peaches, pumpkins, melons, lemons,
Watermelon, strawberry, litchi, papaya, mango, olive, plum, peach, loquat,
Apricots, cherries,
Food: beef, noodles, jiaozi, rice, French fries, bread, sandwiches, wheat, eggs,
Salads, hamburgers, French fries, cereal, cheese, hot dogs, biscuits,
Green peppers, pancakes, potato chips, fish, chicken, meat, tofu, pizza, candy, chewing gum,
Barbecue, popcorn, brown bread, chocolate, shrimp, dessert,
Musical instruments: guitar, piano, drum, trumpet, violin, accordion, erhu,
Electrical appliances: telephone, telephone, computer, TV, radio, mobile phone,
Keywords refrigerator oven, microwave oven, blender, air conditioner,
Typewriter, tape recorder, lamp,
Weather: sunny, rainy, cloud, wind, story, fog, sunny, snow,
Cold, cold, hot, warm, wet,
Study: Chinese, math, English, PE, music, history, physics, biology,
Geography, chemistry, politics, computer, science, art, algebra,
Genealogy: grandfather, grandmother, father, mother, uncle, aunt, sister,
Brothers, sons, daughters, cousins, husbands, wives, parents,
Kitchenware: bowls, plates, tables, plates, spoons, chopsticks, cabinets, forks, knives,
Personality: funny, smart, cute, smart, friendly, shy, lazy, serious,
Unfriendly, quiet, easy-going, outgoing, generous, moody, cute and lively,
Talented, uneasy, nervous, caring, unusual, creative, hard-working,
Enthusiastic, gentle, polite, confident, energetic, realistic, anxious,
Brave,
Drinks: soda, coffee, milk, water, soda, beer, lemon, juice, orange juice, iced.
Tea, drinks, cola,
Music: Jazz, dance music, country music, classical music, folk music, pop music.
music
This is a senior one and a senior two.
Grade 8 Sipin (Volume II) Final Examination Question 2 (Full score: 80 points)
First, multiple-choice questions (30 points)
1, in our country, the rights of citizens are determined by ()
I. China * * * shall be given by Party B and by the people's governments at all levels.
C. click, click, click, click, click, click, click, click, click, click, click, click, click, click, click, click, click, click, click.
2. In 2003, NPC representatives from all over the country gathered in Beijing. The delegates deliberated and adopted the government work report made by Premier the State Council. The above materials show that ()
China is a country where people are masters of their own affairs. China is a country where people make laws.
There is a hollow column on the lid of the pressure cooker as an exhaust hole, and a cap is worn on the hollow column as a pressure limiting valve. When the pressure of the gas in the pressure cooker exceeds the safe value, the gas in the cooker will rush out of the pressure limiting valve, and some gas will escape, thus reducing the pressure of the gas in the cooker. At present, there is a pressure cooker with a diameter of 24 cm. The cross-sectional area of the hollow column hole is10mm2, and the mass of the pressure limiting valve is100g.
1. What is the maximum pressure of the gas in the pressure cooker?
2. Tested by the commodity quality inspection department, the maximum pressure of the gas in the pressure cooker shall not exceed 1.8× 10 to the 5th power Pa. Can the pressure cooker continue to be used safely with the original pressure limiting valve? If not, what is the mass of the pressure limiting valve? (g = 10N/kg)
Answer:
1, maximum pressure p = n/s = mg/s = 0.1*10 *1000000//kloc-0+100000 = 200000.
2、m = G/G = PS/G =( 180000- 100000)* 10/( 100000 * 10)= 0.08kg