Một người ở dưới tàu ngầm muốn quan sát trên mặt nước biển,hay ở dưới hầm muốn quan sát trên mặt đất thì người ta đã dùng một loại dụng cụ.em hãy cho biết tên gọi của dụng cụ đó là gì.và cấu tạo cơ bản của nó như thế nào

Và bài a/30 = 28/24 Các bạn giúp mk 2 bài này nhà . Mk cảm ơn

Cần gấp vote 5 sao và ctlhn. Cho tam giác ABC có AC = 5, BC = 3, góc C = 120 độ. Tính độ dài cạnh AB, tính diện tích tam giác ABC, tính đường cao AH và bán kính đường tròn ngoại tiếp R của tam giác đó?

Ai giúp mình với!!! Mình đang gấp lắm

tính giúp em với ạ 250 x 2 : 5 = ??? 500 : 10 x 2 = ????

Calli: iu An nhìu hoặc xl An mờ :")

1/2 mũ 2 -1/3 mũ 2-1/4 mũ 2 - .......-1/100 mũ 2 > -1 so sánh hộ em

V. Reading: (2ms) Task 1: Read and complete the passage with the words in the box.(1m) read - relax - about - whole - swimming - for I think that (1)………………..is a good activity. There are some reasons (2)……for……....this. Firstly, it gives you a strong heart. Secondly, it is a good way to (3)……………….and feel good. Thirdly, it makes your muscles stronger. Finally, it helps exercise your (4)…………. body. Besides, it relaxes your mind. In short, you should go swimming to keep fit.

Read the following passage and choose the option (A, B, C or D) that best answers each of the questions below. At the top of the list of the costliest natural disasters in the history of the United States is Hurricane Katrina. Hurricane Katrina was the third strongest hurricane ever to hit the U. S. It affected 90,000 square miles in Louisiana, Mississippi, Florida, and Alabama. The hurricane formed over the Bahamas and turned into a Category 1 hurricane by the time it hit the southeastern tip of Florida. It got stronger as it traveled across the Gulf of Mexico. It made its second landfall off the coast of southeast Louisiana on Monday, August 29, 2005. It had become a category 4 hurricane by then. The storm surge that followed caused destruction from central Florida to Texas. New Orleans, Louisiana, experienced even more damage because its levees were breeched, letting water flood a large portion of the city. The National Weather Service warned people of the tropical monster that was heading towards the southern coast. Residents were told to expect power outages. They were told they might lose their rooftops and to expect water shortages. The National Hurricane Director was very concerned. He personally called the governors of Louisiana and Mississippi. He even called President Bush at his ranch in Texas. He spoke directly with New Orleans mayor Ray Nagin. Nagin issued an evacuation order for his city. Most people left. About eighty percent of the population evacuated. The estimate was that around 100,000 people remained in the metro area. Some were stranded tourists; others did not own a car and had no way out. Those who were not able to leave were instructed to go to the New Orleans Convention Center and the Superdome. 41. What is the passage mainly about? A. The history of the United States hurricanes. B. A hurricane in the history of the United States. C. Hurricanes in the world, especially in the United States. D. What the United States does to prevent hurricanes. 42. According to the passage, what is NOT true about Hurricane Katrina? A. It is the costliest natural disaster in the history of the United States. B. It is the third strongest hurricane ever to hit the US. C. It affected 90,000 square miles in Louisiana, Mississippi, Florida, and Alabama. D. It formed over the Bahamas. 43. What can be true from the passage about Hurricane Katrina when it hit the southeastern tip of Florida? A. It was very weak. B. It was very strong. C. It was not as weak as it started. D. It was not as strong as it started. 44.What is NOT true about the National Hurricane Director? A. He called the governors of Mississippi. B. He called President Bush at his ranch in Texas. C. He spoke directly with the New Orleans mayor. D. He was very unconcerned. 45. According to the passage, how many people were evacuated? A. About 80,000 people. B. About 80% of the population. C. Around 100,000 people. D. Around 20% of the population.

Làm giúp mình trước 12h trưa nay nhé !!! WRITING Rewrite the following sentences with the given words. 1. The last person that leaves the house must lock the door. (Reducing the relative clause) @ The ………………………………………………………………………………………………………….. 2. I can’t remember the name of the garage. We had the car repaired at this garage. (Using a relative pronoun) @ I _______________________________________________________________________________ 3. I’m sure that you are exhausted because you've been driving all day. (using “must”) @ You ______________________________________________________________________________ 4. We didn’t go on holiday because we didn’t have enough money. @ If we ___________________________________________________________________________ 5. I would like to express my thanks for everything you have done for me. (using the word “ thankful” ) @ I’d like …………………………………………………………………………………………………. 6. The porter said to me, "I'll wake you up when the train arrives in Leeds."(using Reported speech) @ The porter……………………………………………………………………………………………….. 7. Don’t be impatient or you will make mistakes. => If…………………………………………………………………….................................. 8. The car breaks down so often because you don’t take good care of it. => Were you ………………………………………………………………………………......... 9. A number of suggestions were made at the meeting. Most of them were not very practical.(Using a relative pronoun) => Most of the……………………........................................................................................................………. 10. "Phone to me for an answer tomorrow” the manager said to the client. (using Reported speech) => .................................................................................................................................................................... 11. It is necessary to finish the project today. (using “needs”) @ The project ............................................................................................................................................ 12. It's possible that Joanna didn't receive my message. @ Joanna might ........................................................................................................................................ 13. It wasn’t Tom in the mall yesterday because he was in the hospital. I’m sure. @ Tom can’t…………………………………………………………..……………..…………………….. 14. It was wrong of you to criticize him in front of many people. @ You shouldn’t …………………………………………………………………………………..…..… 15. He regrets having said those terrible things. @ He wished..............…………………………………………………………………………….………… 16. I’m sure that he did it on purpose. @ He must………………………………………………………………………….…………..…..….…… 17. It is not neccessary for you to pay too much attention to your appearance. @ You don’t ..................................................................................................................................................... 18. Life on earth will be destroyed if nuclear tests do not stop. @ Should ………………………………………………………………………………… 19. This is the first time I have ever met such a kind-hearted girl. @ She is ……………………………………………...........................................................................….. 20. Lan’s house is 115 square meters wide, An’s house is 115 square meters wide, too. (using “size” ) @ Lan’s house ..............................................................................................................................................