Trong hệ tọa độ (p,V) , đường đẳng nhiệt là

Giá cả của hàng hóa là thước đo của

Trong số các nguyên tố hóa học, cơ thể người cần khoảng bao nhiêu nguyên tố?

Nội dung nào sau đây không phản ánh đúng vai trò của tri thức lịch sử đối với cuộc sống con người?

Phát biểu nào sau đây không đúng với ngoại thương?

Internet là thuật ngữ dùng để chỉ loại mạng nào sau đây?

Nguyên nhân nào dưới đây làm miền Bắc Việt Nam có thời tiết lạnh khô vào nửa đầu mùa đông?

Đặt một hiệu điện thế không đổi vào hai đầu một biến trở R. Điều chỉnh giá trị R và đo công suất toả nhiệt P trên biến trở. Chọn phát biểu đúng.

Ở trạng thái cơ bản cấu hình electron nguyên tử nào sau đây là của phi kim?

Vào năm 2020, dân số của một quốc gia là khoảng 97 triệu người và tốc độ tăng trưởng dân số là \(0,91 \%\). Nếu tốc độ tăng trưởng dân số này được giữ nguyên hàng năm, hãy ước tính dân số quốc gia đó vào năm 2030

*Kết quả lấy phần nguyên.

Ngày 17-12-2014 đã diễn ra sự kiện lịch sử nào trong quan hệ ngoại giao giữa Mĩ và Cuba?

Sentence rewriting: Immediately after the last bell chimed, the students hastily left the classroom for summer vacation.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34. Foot-racing is a popular activity in the United States. It is seen not only as a competitive sport but also as a way to exercise, to enjoy the camaraderie of like-minded people, and to donate money to a good cause. Though serious runners may spend months training to compete, other runners and walkers might not train at all. Those not competing to win might run in an effort to beat their own time or simply to enjoy the fun and exercise. People of all ages, from those of less than one year (who may be pushed in strollers) to those in their eighties, enter into this sport. The races are held on city streets, on college campuses, through parks, and in suburban areas, and they are commonly 5 to 10 kilometers in length. The largest footrace in the world is the 12-kilometer Bay to Breakers race that is held in San Francisco every spring. This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific Ocean. There may be 80,000 or more people running in this race through the streets and hills of San Francisco. In the front are the serious runners who compete to win and who might finish in as little as 34 minutes. Behind them are the thousands who take several hours to finish. In the back of the race are those who dress in costumes and come just for fun. One year there was a group of men who dressed like Elvis Presley, and another group consisted of firefighters who were tied together in a long line and who were carrying a fire-hose. There was even a bridal party, in which the bride was dressed in a long white gown and the groom wore a tuxedo. The bride and groom threw flowers to bystanders, and they were actually married at some point along the route.

Which of the following is NOT implied by the author?

Một bóng đèn 220 V – 100 W có dây tóc làm bằng vonfram. Khi đèn sáng bình thường thì nhiệt độ của dây tóc là 2000 ⁰C. Ở nhiệt độ môi trường 20 ⁰C thì điện trở của dây tóc đèn là bao nhiêu? Biết hệ số nhiệt điện trở của vonfram là 4,5.10^-3 K^-1.

Điện trở của bóng đèn khi không thắp sáng là bao nhiêu ôm (làm tròn kết quả đến chữ số hàng phần mười)?

Phép tuyển (phép cộng lôgic) của 2 mệnh đề đúng cho ra kết quả là gì?

Phát biểu nào sau đây không chính xác?

Read the following passage about managing change and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40. 

Growing up in Athens, Greece, Lydia Borsi remembers feeling tested when she tried to deal with mental health issues. Borsi says she had been seeing a therapist for anxiety. But she notes that people in Greece do not openly discuss mental health issues, which also get little attention in general healthcare services. “It was a lot more secretive. And people thought that I was a lot more unique,” Borsi said.

That all changed in 2017 when she moved to the United States to study at the University of Rochester in Rochester, New York. “When I came here, I really liked that people were not afraid to speak up about mental health and say that it’s important,” she said. The university was very supportive of her needs and offered plenty of information. She also became involved with a school group called Active Minds that helps students deal with mental health issues. [A]

Then due to the spread of the novel coronavirus, the University of Rochester had to move all its classes and some of its mental health resources online. Luckily, Borsi was able to connect with a mental health expert outside the school, in the local community. [B]

But as many of her American friends returned home, Borsi was stuck. Greece had succeeded in limiting the spread of the virus within its borders, but flights there from the U.S. are barred until July. Also, the health crisis has put her plans to seek admission to medical school in Britain on hold. [C] And she is not alone.

[D] In April, Active Minds launched a survey of over 2,000 students at U.S. colleges and universities. The study found that over 80 percent of those asked said the coronavirus crisis had negatively affected their mental health. One in five said it has affected them severely.

Laura Horne, chief program officer at Active Minds, says the findings are especially troubling given that the crisis is only going to make it harder for colleges and universities to help these students. “Colleges and universities had to pivot rather quickly to respond to COVID-19 and figure out all facets of university life, including mental health services. Now they have to figure out how to communicate with students,” Horne said.

Frank Chen is a Houston, Texas-based psychiatrist who has worked with college-age young adults. He points out that individuals at that age are in an important stage of their mental development. And college can be a difficult experience for students with or without mental health issues, as they balance work, studies, and personal relationships. Adding a major world event, like the spread of the coronavirus, makes it very difficult to predict what the long-term psychological effects might be. “I don’t think that there’s another event in the history of the people who are alive now that can really measure up to this,” said Chen.

What does Frank Chen mean when he says, ‘I don’t think that there’s another event in the history of the people who are alive now that can really measure up to this’?

Một ô tô đang chạy với tốc độ \(108\,km\text{/}h\) thì người lái xe bất ngờ phát hiện chướng ngại vật trên đường. Người lái xe phản ứng một giây sau đó bằng cách đạp phanh khẩn cấp. Kể từ thời điểm này, ô tô chuyển động chậm dần đều với tốc độ \(v\left( t \right)=-10t+30\,\,\left( m\text{/}s \right)\), trong đó \(t\) là thời gian tính bằng giây kể từ lúc đạp phanh. Gọi \(s\left( t \right)\) là quãng đường xe ô tô đi được trong \(t\left( s \right)\) kể từ lúc đạp phanh.

Chủ thể tiêu dùng có những tác dụng gì?

Cho hai tập hợp $A=\left[ -5;3 \right), \, B=\left(1;+\infty \right)$. Khi đó $A \cap B$ là tập nào sau đây?