Ở động cơ điêzen 4 kì, xupap thải mở ở kì nào?

Năm 1975, quân dân Việt Nam giành thắng lợi trong chiến dịch nào sau đây?

Cách mạng tháng Tám (1945) ở Việt Nam có điểm khác biệt nào sau đây so với Cách mạng tháng Mười (1917) ở Nga? 

Read 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.

TO STAY HEALTHY, BEGIN AT HOME!

Let’s look at what we can do each day to improve our health and well-being.

Facts and Figures:

Over 30% of adults do not get enough physical activity, and (7)_______ spend hours sitting in front of screens, which affects both their physical and mental health.

Positive Actions!

(8)________  your intake of sugary or salty processed foods and opt for healthier alternatives like fruits or nuts.

Focus on (9)________ fresh, nutrient-rich foods rather than heavily processed ones. This not only nourishes your body but also helps the environment by reducing (10)________.

(11)_________ how busy your schedule is, dedicate at least 30 minutes a day to physical activity. Consistency is key!

Start Today!

Small changes can lead to big (12)_______. Make the choice to live a healthier, happier life!    

Parabol \((P):y = {x^2} - 6x + 5\) có bao nhiêu điểm chung với trục hoành?

Xác định một từ/cụm từ SAI về ngữ pháp/hoặc ngữ nghĩa/logic/phong cách.

Đọc câu chuyện của người đàn bà được khắc họa trong truyện ngắn “Chiếc thuyền ngoài xa” nhận thấy người đàn bà là hiện thân cho kiếp người bất hạnh bị cái đói khổ, cái ác và số phận bi kịch dồn đến chân tường.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions

[I] A newborn baby can see, hear and feel. By the age of five, a child can talk, ride a bike and invent imaginary friends. How does this development happen? [II]We don't understand the way language, thinking and planning develop very well. [III]Now scientists are using new technology to ‘see’ into children's brains. And they are discovering new information about the way a baby's brain develops. [IV]

A study in 2010 showed that children who were afforded more focus often gained an edge in IQ. The brain of a newborn infant contains nearly a hundred billion neurons. This number is comparable to that of an adult's brain. As they mature, an infant assimilates information through the sensory modalities of sight, hearing, smell, taste, and touch. This information fosters intricate connections between different regions of the brain. By the age of three, there are approximately a hundred trillion synaptic connections.

One experiment looked at images of babies' brains while they were listening to different sounds. The sounds were in different sequences. For example, one sequence was mu-ba-ba. This is the pattern ‘A-B-B’. Another sequence was mu-ba-ge. This is the pattern ‘A-B-C’. The images showed that the part of the brain responsible for speech was more active during ‘A-B-B’ patterns. This shows that babies can tell the difference between different patterns. This experiment is interesting because sequences of words are important to grammar and meaning. Compare two sentences with the same words in a different order: ‘John killed the bear’ is very different from ‘The bear killed John.’ So babies are starting to learn grammatical rules from the beginning of life.

Researchers also know that babies need to hear a lot of language in order to understand grammar rules. But there is a big difference between listening to television, audiobooks or the internet, and interacting with people. One study compared two groups of nine-month-old American babies. One group watched videos of Mandarin Chinese sounds. In the other group, people spoke the same sounds to the babies. The test results showed that the second group could recognize different sounds, however, the first group learned nothing. The scientist, Patricia Kuhl, said this result was very surprising. It suggests that social experience is essential to successful brain development in babies.

Which of the following is TRUE according to the passage?

Đại lượng nào dưới đây là đại lượng vectơ?

Nội dung nào sau đây là một trong những vai trò của lịch sử và văn hóa đối với sự phát triển ngành du lịch?

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.

When parents name their children, they often take into consideration their own preferences, family traditions, or beliefs. In many European cultures, parents typically select names based on family connections, often honoring grandparents or ancestors. For instance, in Italy, children are commonly named after their grandparents, starting with the father's parents and then the mother's. Similarly, in Eastern Europe, children may be named after their deceased relatives to protect them from harm.

In some Asian countries, the naming process may involve the child's grandfather or a fortune-teller, who chooses a name believed to shape the child's character. Names might be inspired by elements like fire, water, earth, wood, or metal, or they may convey qualities such as beauty, strength, or kindness.

African cultures also have unique naming traditions, such as in Ghana's Akan culture, where a child's name is determined by the day of their birth. Each day has specific names for boys and girls, reflecting characteristics associated with that day. For example, a boy born on Friday might be named Kofi, symbolizing a "wanderer" or "explorer" while a girl born on the same day could be named Afua, also representing a traveler.

No matter where a name originates, it holds significant meaning and reflects the child's cultural heritage. Whether chosen out of preference or dictated by tradition, a child's name is a cherished and respected gift.

Which is true in Akan culture if a twin brother and sister are born on a Friday?

Trong môn trượt băng nghệ thuật, khi bắt đầu buổi biểu diễn, từ trạng thái đứng yên hai vận động viên đẩy nhau ra xa và chuyển động trên cùng một đường thẳng. Chọn mốc thời gian \(t=0\) tại thời điểm hai vận động viên bắt đầu tách rời nhau. Tại thời điểm \(0,6\text{ }\!\!~\!\!\text{ s}\) vận động viên nữ đã di chuyển được \(2,7\text{ }\!\!~\!\!\text{ m}\). Tại thời điểm \(1,2\text{ }\!\!~\!\!\text{ s}\) vận động viên nam đã di chuyển được \(3,6\text{ }\!\!~\!\!\text{ m}\). Coi ma sát là không đáng kể, tỉ số khối lượng giữa vận động viên nam và vận động viên nữ là:

Chiến tranh thế giới thứ nhất bắt đầu với sự kiện nào?

Hội nghị Vec-xai - Oa-sinh-tơn diễn ra trong hoàn cảnh nào?

Mỗi công dân cần làm gì để thực hiện đúng với nghĩa vụ tuân thủ Hiến pháp?

Khi thiếu hoặc thừa nguyên tố khoáng, thực vật có biểu hiện là như thế nào?

Sau khi tốt nghiệp THPT, Y đã theo bạn bè rủ rê tham gia vào tệ nạn xã hội. Một lần, khi đang thực hiện vận chuyển, buôn bán ma túy thì bị bắt. Y đã không:

Read the following passage about the impact of social media on mental health 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.

          [I] In recent years, social media platforms have become a central part of daily life, offering users countless ways to connect, share, and communicate. [II] While these platforms offer many advantages, experts have noted rising concerns about their effects on mental health, particularly among young people (Smith & Anderson, 2018). [III] Studies reveal that excessive social media use can contribute to feelings of anxiety, depression, and loneliness, despite its intention to promote connection and social interaction (Twenge & Campbell, 2019). [IV]

          A primary reason for these mental health concerns is the tendency for social media users to compare themselves to others. Platforms like Instagram and Facebook often highlight idealized lifestyles, leading users to feel inadequate about their own lives. Additionally, the constant notifications and messages contribute to a "fear of missing out," or FOMO, which keeps individuals in a cycle of checking their phones, often reducing the quality of sleep and overall well-being.

          There is also a growing body of research suggesting a link between social media use and decreased attention spans. When users frequently switch between apps and notifications, their ability to focus for extended periods may diminish (Rosen, 2019). This shift in attention can interfere with productivity, especially in academic and professional settings, where sustained focus is essential.

          Addressing these challenges requires a multi-faceted approach. Some mental health professionals suggest limiting screen time and setting boundaries, such as "device-free" hours before bedtime. Others recommend engaging in offline activities, like reading or exercising, to reduce dependence on social media and build healthier habits. According to psychologists, such strategies can enhance mental resilience and allow for more meaningful, balanced relationships (Robinson & Smith, 2020).

According to paragraph 2, which of the following is NOT an effect of social media on mental health?

Đường mà vật chuyển động vẽ ra trong không gian chúng ta sử dụng khái niệm nào?

Dùng một đồng hồ đo thời gian có độ chia nhỏ nhất 0,001 s để đo n lần thời gian rơi tự do của một vật bắt đầu từ điểm A (v_A = 0) đến điểm B, kết quả cho trong bảng dưới đây. Thời gian rơi trung bình, sai số ngẫu nhiên, sai số phép đo thời gian là bao nhiêu? Kết quả đo được ghi như thế nào? Biết sai số dụng cụ là 0,001 s.

Sai số tuyệt đối của phép đo thời gian là

$\Delta t=\overline{\Delta t}+\Delta t_{dc}=$ s.

Kết quả phép đo được ghi như sau:

Cá thể có kiểu gen AB/ab, giảm phân xảy ra hoán vị gen với tần số là f=20%, cho tỉ lệ các loại giao tử là: AB = ab = (1-f)/2=40%, Ab=aB=f/2=10%?