ai điện tích điểm cùng độ lớn 10^-9 C đặt trong chân không. Khoảng cách giữa chúng bằng bao nhiêu để lực tĩnh điện giữa chúng có độ lớn 2,5.10^-6 N ?

Nhận định nào sau đây không đúng với thuận lợi chủ yếu để phát triển kinh tế của Hoa Kì?

Gọi \(n\) là số nghiệm của phương trình \(\text{sin}\left( 2x+{{30}^{\circ }} \right)=\frac{\sqrt{3}}{2}\) trên khoảng \(\left( -{{180}^{\circ }};{{180}^{\circ }} \right)\). Tìm \(n\).

Nhận định nào sau đây là đặc điểm của ngân sách nhà nước?

Các đối tượng có thể có trong phim hoạt hình là?

Bước 1 của quy trình thiết kế kĩ thuật là:

Dầu và mỡ được cấu tạo bởi những thành phần nào?

Thị trường có những chức năng gì?

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

Dear Mrs. Chen,

a. You changed my life. Now I change other lives too.

b. I remember when I could not read well. You sat with me every day. You never got angry.

c. Thank you for being my teacher. You helped me learn so much.

d. Now I am a teacher too! I help children read, just like you helped me.

e. My students love your story. I tell them about you. They want to be kind like you.

Please visit my class one day. My students want to meet you.

With love,

LK

Ba nền kinh tế phát triển nhất trong Liên minh châu Âu là

Choose the word whose underlined part differs from the other three in pronunciation: cheap, child, chemist, chair

Truyện về các vị thần sáng tạo thế giới thuộc nhóm thần thoại nào?

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

Mai: "How fashionable a pair of trainers you have!”
Nam: "_________________."

Cho biết: Chức năng điều hòa hấp thụ các chất dinh dƣỡng và thải các sản phẩm trao đổi chất là?

Anh T là chủ của một công ty chuyên sản xuất giày dép, hằng ngày anh đến công ty giám sát và hướng dẫn nhân viên cách làm ra sản phẩm chuẩn. Sản phẩm của công ty anh T được rất nhiều người tiêu dùng tin tưởng sử dụng. Trong trường hợp trên, anh T tham gia vào nền kinh tế với vai trò là chủ thể gì?

Cho hai góc α và β (0° ≤ α, β ≤ 180°) với α + β = 90°. Giá trị của biểu thức P = cosα.cosβ ‒ sinα.sinβ là?

Read the following passage about Preserving Today's Soundscapes for Future Generations 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 23 to 30.

Sonic time capsules save today's sounds for future people. Scientists capture everyday sounds like streets, birds, and children playing in parks around the world. These recordings help us remember our world before changes. Cities are losing unique sounds as life becomes similar everywhere. Old machines, music, and natural sounds might disappear if not saved. Many important cultural sounds are already lost forever because nobody thought to record them when they still existed.

Sound collectors use microphones to record in different places. They visit forests, oceans, cities, and villages to capture soundscapes throughout different seasons and times of day. They store sounds in digital libraries for years. Museums have rooms for listening to past sounds. These experiences help people understand history in ways books cannot. Some researchers travel to remote locations to record indigenous languages and traditional ceremonies before they vanish from our collective memory.

Climate change is changing world sounds. Melting glaciers, endangered animals, and disappearing languages need saving before they're gone. Researchers believe future people will want to know how our world sounded. These capsules will be important records, like photographs. Scientists study how sounds affect human health. The sounds of nature can reduce stress and improve mental health, which makes preserving natural soundscapes even more important for future generations who may live in highly urbanized environments.

Community projects invite people to record daily sounds. Children learn to listen carefully to the world around them and identify sounds that matter to their community. Old people share recordings from their childhood. People feel emotions when listening to these collections. Artists create music using everyday recordings. These projects help communities protect special sounds for the future. Some cities now have sound preservation policies that protect unique acoustic environments just as they would protect historic buildings or natural landscapes from development.

The word “they” in paragraph 2 refers to _________.

Read of the following leaflet and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.

Colors of Humanity: Experience the World in One Place

Join our amazing cultural festival!

One culture might showcase exuberant, saturated colors in its artistic traditions, while (7)_________ artistic traditions cultivate an appreciation for more restrained, gentle chromatic expressions. Our festival (8)_________ cultures from around the world.

The (9)_________ on children's faces makes our event special. (10)_________ language differences, people connect through art.

The beauty of traditional (11)_________ attracts many visitors. A (12)_________ of food from different countries will be available to try.

Festival Details:

Date: June 15-17, 2025

Location: City Park

Free entry for children

Food and craft markets

Music and dance shows every hour

Contact: worldcolors@example.com | 555-0123

Cho hàm số \(f(x) = {x^2} - 4x + 3\). Chọn khẳng định đúng?