Cuộn cảm lõi không khí là loại linh kiện điện tử được thiết kế không sử dụng lõi từ mà chỉ có dây quấn trong không khí được biểu diễn như hình. Hình dạng phổ biến của cuộn cảm này thường là các vòng dây xoắn hình trụ hoặc hình lò xo, giúp tạo từ trường khi có dòng điện chạy qua. Đặc điểm nổi bật của cuộn cảm lõi không khí là không bị hiện tượng bão hòa từ phù hợp với các mạch cao tần.

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions: I’m becoming increasingly absent-minded. Last week, I locked myself out of my house twice.

Read the following passage about the Second Acts That Inspire 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.

Life often presents us with unexpected challenges that force us back to the drawing board. Whether due to personal setbacks, career changes, or unforeseen circumstances, the courage to begin again can lead to remarkable transformations. Many inspiring individuals have shown that it's never too late to reinvent oneself and pursue new dreams. Throughout history, countless people have overcome seemingly impossible situations through sheer determination.

[I] Take J.K. Rowling, for instance. Before becoming a literary sensation, she was a struggling single mother living on welfare. [II] Her determination eventually paid off when her books became a global phenomenon, proving that setbacks can become stepping stones to success. [III] This remarkable turnaround demonstrates how resilience and unwavering belief in oneself can overcome seemingly insurmountable obstacles. Despite facing depression and financial hardship, she never gave up on her dreams. [IV]

Colonel Harland Sanders' story is another testament to the power of starting anew. At the age of 65, when most people contemplate retirement, he found himself struggling financially after his restaurant failed. Instead of giving up, he traveled across America, sleeping in his car while pitching his chicken recipe to restaurant owners. His recipe for success wasn't just about the perfect blend of herbs and spices; it was about persistence and determination. After facing over 1,000 rejections, he finally established Kentucky Fried Chicken, which grew into a global empire. His unwavering spirit and dedication inspired generations of entrepreneurs worldwide.

These inspiring stories remind us that failure is not final, but rather a chance to redirect our path. Every setback carries the seed of an equal or greater opportunity, and sometimes the end of one chapter is simply the beginning of a better one. The key lies in having the courage to take that first step, even when the future seems uncertain. As these remarkable individuals have shown, it's never too late to rewrite your story and create a powerful second act. Their journeys teach us that persistence and courage ultimately lead to success.

Where in paragraph 2 does the following sentence best fit?

Against all odds, she persevered through numerous rejections and continued writing her Harry Potter manuscript in local cafes.

Quá trình hoạt động có mục đích, làm cho những quy định của pháp luật đi vào cuộc sống, trở thành những hành vi hợp pháp của các cá nhân, tổ chức là nội dung của khái niệm nào sau đây?

Để nghiên cứu ảnh hưởng của nước lên sự sinh trưởng của cây trồng, bạn An thiết kế 2 chậu cây: ở chậu thí nghiệm, tưới đủ nước; ở chậu đối chứng, không tưới nước. Mô tả này thể hiện bước nào trong tiến trình nghiên cứu khoa học?

Choose A, B, C or D that has the OPPOSITE meaning to the underlined word/phrase in each question.

In some most Asian countries women are undervalued and they never have the same status as men.

Hai đầu mối giao thông đường bộ quan trọng nhất nước ta là

Biện pháp nào bảo vệ thông tin cá nhân không đúng khi truy cập mạng?

Có mấy loại kế hoạch tài chính cá nhân chính?

Xét các đặc điểm sau:

(1) Có sự thay đổi linh hoạt trong đời sống cá thể

(2) Rất bền vững và không thay đổi

(3) Là tập hợp các phản xạ không điều kiện

(4) Do kiểu gen quy định

Trong các đặc điểm trên, những đặc điểm của tập tính bẩm sinh gồm:

Read the following passage about education in Nepal 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. 

Fashion in the 1960s reflected the cultural and political upheaval of the time. The hippie and counterculture movement gave rise to accessories like Pocahontas-style headbands and medallions worn around the neck. Hippies wore long, loosely fitting clothing, often in natural fabrics. Hemlines rose as Mary Quant popularized the miniskirt and hot pants in her lines for JC Penney. And mod fashion, with brightly colored space-age geometric patterns, shift dresses and colored tights became the mainstream. Both miniskirts and mod-shift dresses were worn with knee-high go-go boots.

[A] During the 1970s, the loose-fitting hippie clothes of the prior decade gave way to exotic fabrics and bell-bottom jeans for men and women. Hemlines continued to rise and hot pants continued their popularity, reflecting the flashy style of the decade. However, the 1970s also saw the popularity of a longer hemline, from mid-calf to ankle-length. [B] Women wore peasant-style clothing, especially blouses with off-the-shoulder necklines and lace trim, with their jeans or skirts. [C] Disco fashion emerged, featuring bright patterns and tightly fitting clothing meant to show off the body. Platform shoes elevated their wearer, male or female, anywhere from two to four inches or more. [D]

The 1980s saw another fashion upheaval. Angst-ridden punks wore Dr. Marten and steel-toed army boots, chains, tartan patterns, and bondage pants. Punks focused more on their hair during this period, dying, teasing and chopping their hair into asymmetric styles that seemed to defy gravity. Women—and men—experimented with heavy eyeliner in a variety of colors. Women wore neon colors, jelly shoes, tight jeans, leggings, leg warmers and oversized sweatshirts. Menswear-inspired looks also became popular for both sexes. Men wore ‘power suits,’ named so for their price, which made these suits a reflection of the wealth of the wearer. Women’s jackets featured big shoulder pads that made the shoulders appear higher and larger, similar to the male silhouette.

1990’s fashion was far more subdued than the garish, wild styles of the 1980s. Bands like Nirvana influenced the grunge look, which featured rock-concert tee shirts under plaid flannel shirts, jeans and long, greasy hair. Overalls were worn by both sexes, either with one or both shoulder straps unhooked. The punk style of the 1870s and 1980s evolved into the goth fashion trend, which featured black clothing, black boots and studded bracelets in the style of bands like Nine Inch Nails and Marilyn Manson.

The word “elevated” in paragraph 2 mostly means ______.

Nội dung nào sau đây nói về khái niệm quyền con người?

Một nguyên tố R có Z = 16. Có bao nhiêu phát biểu đúng về R trong các phát biểu sau:

(1) Công thức oxit cao nhất có dạng RO3

(2)Nguyên tử R có 4 electron ở lớp ngoài cùng

(3) R là nguyên tố họ p

(4) R là kim loai

Read the following passage about endangered languages and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questionsfrom 31 to 40.

[I] Social media has become a dominant force in modern communication, offering a range of benefits and challenges. [II] It has revolutionized the way people interact, share information, and even form relationships. [III] While these platforms offer opportunities for connection and expression, they also have their drawbacks. [IV] For instance, excessive use of social media has been linked to a range of negative effects, including mental health issues, social isolation, and decreased productivity. [V] However, when used responsibly, social media can also offer a variety of positive outcomes, such as the ability to stay connected with loved ones, network professionally, and access valuable information and resources.

One of the major benefits of social media is its ability to keep people connected. For example, individuals who live far apart can maintain close relationships through regular communication on these platforms. Social media also facilitates professional networking, allowing users to connect with potential employers or clients, and enabling companies to promote their products and services to a global audience. Additionally, platforms like Facebook, Twitter, and Instagram provide a space for people to share ideas, opinions, and creative work, fostering a sense of community and collaboration.

Despite these advantages, there are serious concerns about the negative impact of social media, particularly on mental health. Studies have shown that excessive social media use can contribute to feelings of anxiety, depression, and loneliness. This is often attributed to the unrealistic portrayals of life that are commonly shared on these platforms, leading to comparisons that can make individuals feel inadequate or left out. Furthermore, constant exposure to negative news or online bullying can exacerbate these feelings and contribute to long-term psychological stress.

Another issue with social media is its potential to distract people from their daily responsibilities. With notifications constantly popping up and endless streams of content to scroll through, individuals may find it difficult to focus on tasks such as work, school, or personal obligations. This can result in decreased productivity and a lack of attention to important matters.

Ultimately, the impact of social media depends on how it is used. If individuals are mindful of their usage patterns and take steps to limit their time on these platforms, they can enjoy the benefits of staying connected and informed without the negative consequences. Parents, educators, and mental health professionals can also play a role in helping young people develop healthy habits and manage their social media use effectively.

Which of the following best summarizes paragraph 3?

Nêu định nghĩa ROM?

Chuyển hoá cơ bản là gì?

Để ca ngợi đất nước Việt Nam tươi đẹp ta có thể làm những hoạt động nào sau đây?

Một trong những quy định của pháp luật về bình đẳng giới trong lĩnh vực chính trị là: nam, nữ bình đều đẳng trong việc nào?

Những nguyên tố đa lượng nào chiếm khoảng 96 % khối lượng vật chất sống ở hầu hết các cơ thể sinh vật?

Ngoc _______ in the kitchen when she saw a mouse.