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3 tháng 4 2021
*Không chắc lắm,lớp 9 hơi căng.
1. Is this the first time you have been to London ?
2. We have not gone to Spain for three years.
3. The old house on the plateau that we visited was magnificent.
4. In spite of the heavy traffic, Ba went to school on time.
7. In spite of being ill, she went to school.
8. The man whom I spoke to last night comes from Australia.
10. Viet Nam, which export rice to other countries, is in Asia.
3 tháng 4 2021
5. Despite my mother's age, she still works hard.
6. Despite taking the first train, she went to the meeting late.
9. Nguyen Du, who wrote the story of Kieu, was a famous poet.
15 tháng 6 2018
Tổng số hạt trong M2X là 140, ta có:
\(\Rightarrow2\left[2P\left(M\right)+N\left(M\right)\right]+2P\left(X\right)+N\left(X\right)=140\)
\(\Leftrightarrow4P\left(M\right)+2P\left(X\right)+2N\left(M\right)+N\left(X\right)=140\) (1)
Số hạt mang điện nhiều hơn không mang điện là 44:
\(\Rightarrow4P\left(M\right)+2P\left(X\right)-\left[2N\left(M\right)+N\left(X\right)\right]=44\) (2)
Số khối của M{+} nhiều hơn X{2-} là 23:
\(\Rightarrow P\left(M\right)+N\left(M\right)-\left[P\left(X\right)+N\left(X\right)\right]=23\)
\(\Leftrightarrow P\left(M\right)-P\left(X\right)+N\left(M\right)-N\left(X\right)=23\) (3)
Tổng số hạt trong M{+} nhiều hơn trong X{2-} là 31:
\(\Rightarrow2P\left(M\right)+N\left(M\right)-1-\left[2P\left(X\right)+N\left(X\right)+2\right]=31\)
\(\Leftrightarrow2\left[P\left(M\right)-P\left(X\right)\right]+N\left(M\right)-N\left(X\right)=31\) (4)
Lấy (1) + (2) , ta có:
\(\Rightarrow8P\left(M\right)+4P\left(X\right)=184\) (5)
Lấy (4) - (3), ta có:
\(\Rightarrow P\left(M\right)-P\left(X\right)=11\) (6)
Từ 5; 6 \(\Rightarrow\orbr{\begin{cases}P\left(M\right)=9\\P\left(X\right)=8\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}M\text{ là }Kali\left(K\right)\\X\text{ là }Oxi\left(O\right)\end{cases}}\)
\(\Rightarrow M_2X\text{ là }K_2O\)
15 tháng 6 2018
Số hạt mang điện trong hợp chất là (140+44)/2=92(hạt);
Số hạt mang điện trong M là (92-22)/2=35(hạt);
Số hạt mang điện trong X là (35+22)=57(hạt);
YN
12 tháng 4 2021
*Tiếng Anh lớp 9 mình chưa học rõ,mới tìm hiểu qua,nếu có sai thì bạn thông cảm
1, The runway at Qamdo Bamda Airport in Tibet is 5.5 kilometers long; it needs to be this length to allow planes to accelerate enough to take off at high altitude.
2, A cockpit is the area of a plane where the pilot and co-pilot seat, and is also known as the flight deck.
3, It is estimated that there will be about 2 billion motorists in the world by 2035.
4, Research shows the average American commuter spends 142 hours every year stuck in traffic.
5, Vehicles running on diesel are believed to be more harmful to the environment and members of the public than petrol vehicles.
6, Dangerous overtaking is the most common cause of car accidents worldwide.
7, The first-ever beach departure lounge has been planned in Barbados, where passengers can check-in, pick up their boarding passes and relax until their flight.
VN
23 tháng 4 2024
1. The “runway” at Qamdo Bamda Airport in Tibet is 5.5 kilometers long; it needs to be this length to allow planes to accelerate enough to take off at high altitude.
2. A “cockpit” is the area of a plane where the pilot and co-pilot seat, and is also known as the flight deck.
3. It is estimated that there will be about 2 billion “motorists” in the world by 2035.
4. Research shows the average American “commuter” spends 142 hours every year stuck in traffic.
5. Vehicles running on “diesel” are believed to be more harmful to the environment and members of the public than petrol vehicles.
6. Dangerous “overtaking” is the most common cause of car accidents worldwide.
7. The first-ever beach “departure lounge” has been planned in Barbados, where passengers can check-in, pick up their boarding passes and relax until their flight.
YN
11 tháng 4 2021
*Đây là chương trình lớp 9,mình chưa nắm rõ nên có gì sai sót bạn b.ỏ qua cho mình nhé.
1 When Mark arrived, the Johnsons was having dinner, but they stopped in order to talk to him
2 That is the third cake you have eaten this morning
3 All the food served in this restaurant was excellent.
4 The United Nations play important part in preserving peace for the world.
5 . The test was so difficult that none of us could do it successfully.
6 Either you or your brother will be choose tomorrow.
7 Both Tom and Mary make mistake yesterday.
8 The police was here for security yesterday.
9 Never have Maria seen such a beautiful house.
10 Neither you nor I was here last night.
13 tháng 4 2021
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
8. You______many good choices for the future if you are admitted to a famous university.
A. will have B. had C. would have D. would have had
9. I wish Ann ______ here.She will be able to help us.
A. were B. weren't C. is D. wasn't
10. My brother ______for this company since he left school.
A. works B. has worked C. have worked D. worked
11. I came ______ an old friend while I was walking along the street.
A. across B. into C. over D. for
12. Sarah has to stay in bed for a few days _________ she is sick.
A. because B. and C. but D. although
13. Relax for some minutes and you'll feel more ______
A. comfort B. uncomfortable C. comfortable D. comfortably
14. ___________all over the world, English has become the international language.
A. Speaking B. Spoken C. Speak D. To speak
15. After two hours travelling by bus, they _________ a quiet town by the beach.
A. arrived B. got C. went D. reached
16. If you want to lose weight , you______go on a strict diet.
A. can B. should C. could D. may
17. Living in a far-away town I can’t get______to the Net easily.
A. access B. work C. connect D. relation
18. There are a lot of people here, ______?
A. are they B. are there C. aren’t there D. aren’t they
13 tháng 4 2021
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
8. You______many good choices for the future if you are admitted to a famous university.
A. will have B. had C. would have D. would have had
9. I wish Ann ______ here.She will be able to help us.
A. were B. weren't C. is D. wasn't
10. My brother ______for this company since he left school.
A. works B. has worked C. have worked D. worked
11. I came ______ an old friend while I was walking along the street.
A. across B. into C. over D. for
12. Sarah has to stay in bed for a few days _________ she is sick.
A. because B. and C. but D. although
13. Relax for some minutes and you'll feel more ______
A. comfort B. uncomfortable C. comfortable D. comfortably
14. ___________all over the world, English has become the international language.
A. Speaking B. Spoken C. Speak D. To speak
15. After two hours travelling by bus, they _________ a quiet town by the beach.
A. arrived B. got C. went D. reached
16. If you want to lose weight , you______go on a strict diet.
A. can B. should C. could D. may
17. Living in a far-away town I can’t get______to the Net easily.
A. access B. work C. connect D. relation
18. There are a lot of people here, ______?
A. are they B. are there C. aren’t there D. aren’t they
TC
13 tháng 4 2021
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
8. You______many good choices for the future if you are admitted to a famous university.
A. will have B. had C. would have D. would have had
9. I wish Ann ______ here.She will be able to help us.
A. were B. weren't C. is D. wasn't
10. My brother ______for this company since he left school.
A. works B. has worked C. have worked D. worked
11. I came ______ an old friend while I was walking along the street.
A. across B. into C. over D. for
12. Sarah has to stay in bed for a few days _________ she is sick.
A. because B. and C. but D. although
13. Relax for some minutes and you'll feel more ______
A. comfort B. uncomfortable C. comfortable D. comfortably
14. ___________all over the world, English has become the international language.
A. Speaking B. Spoken C. Speak D. To speak
15. After two hours travelling by bus, they _________ a quiet town by the beach.
A. arrived B. got C. went D. reached
16. If you want to lose weight , you______go on a strict diet.
A. can B. should C. could D. may
17. Living in a far-away town I can’t get______to the Net easily.
A. access B. work C. connect D. relation
18. There are a lot of people here, ______?
A. are they B. are there C. aren’t there D. aren’t they
13 tháng 9 2021
Tham khảo : https://h .vn/hoi-dap/question/18383445.html
N
13 tháng 9 2021
1. The man whom Julie invited was late.
2. The accountant who works for my father’s company was arrested.
3. I wrote to the friend. You met the friend last week.
@……… I wrote to the friend whom you met last week.
4. The mobile phone can’t be fixed. The mobile phone is broken.
@………The mobile phone which is broken can’t be fixed.
5. I met a girl. The girl was a doctor.
@……… I met a girl who was a doctor.
6. We called a doctor. The doctor works at a hospital in London.
@………We called a doctor who works at a hospital in London.
7. I went to the restaurant. I read about the restaurant in the newspaper.
@………I went to the restaurant which I read about in the newspaper.
8. She bought a car which her sister d
9. I often buy cheese. The cheese is imported from Paris.
@………I often buy cheese which is imported from Paris.
10. The nurse is in the office. The nurse treated my grandmother.
@………The nurse who treated my grandmother is in the office.
11. The car is in the garage. The car broke down.
@………The car which broke down is in the garage.
12. Let me see the pictures. You took them at Peter's wedding.
@……… Let me see the pictures which you took at Peter's wedding.
13. Manchester is the largest city in USA. My brother lives there.
@………Manchester is the largest city in USA where my brother lives
14. Summer is the time. The weather is very hot then.
@………Summer is the time when the weather is very hot
15. I’ve recently gone back to the town. I was born in the town.
@……… I’ve recently gone back to the town where I was born
Nguồn : học 24
HT
LH
5
4 tháng 5 2019
The match lasts ninety minutes
-> It take -place within ninety minutes----------------------------
These shose're both beautiful and affordable - I can't make ______________ mind
A.in
B.on
C.up
D.with
* Chọn C , make up mind : quyết định
These shose're both beautiful and affordable - I can't make mind
A.in
B.on
C.up
D.with