Chuyển động của vật nào sau đây là dao động cơ?

Loài động vật nào dưới đây vừa tiêu hóa nội bào, vừa tiêu hóa ngoại bào?

Các tài liệu hướng dẫn sử dụng thiết bị số thường có mục nào sau đây?

Một sóng cơ hình sin truyền trong một môi trường. Xét trên một hướng truyền sóng, khoảng cách giữa hai phần tử môi trường

Nguyên tử nguyên tố X phổ biến trong tự nhiên có tổng các hạt cơ bản là 46. Số khối của nguyên tử X là

Choose the correct answer to complete each of the following sentences.

My boss, __________ is always understanding, gave me a day off as I was tired.

Read the following advertisement 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 1 to 6.

DISCOVER THE FUTURE OF LEARNING WITH SMARTLEARN!

Are you ready to learn in a fun and easy way? Try SmartLearn – the app that makes studying (1)________ for everyone! SmartLearn helps students of all ages learn (2)________ and improve their grades. With SmartLearn, you can study anytime, anywhere! The app offers interactive lessons in many subjects like math,  science, English, and history. You can play games, watch videos, and take quizzes to remember what you learn. The lessons (3)________ by teachers are simple and enjoyable. Plus, SmartLearn is safe and family-friendly, so parents can trust it! Download the app today on your phone or tablet (4)________ free. You can try basic lessons or (5)_______ premium access for more features, like personalized study plans and expert tips. Start (6)________ with SmartLearn and see the difference. Don’t wait – get smarter today!

Read the following passage 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 30 to 34.

    A new study highlights the health benefits of natural spaces in urban areas. Researchers found that people (30) _______ with plenty of green space, such as parks, have lower stress levels. (31) ____________ showed higher stress levels than men in the same situation.

    The research proved that why (32) _______. There is good evidence from the UK and elsewhere suggests that green spaces lead to lower blood pressure, better mental health, and (33)____________or dying from heart disease.

    Studies also indicate that spending time in natural environments improves mental and physical health, reducing the burden on healthcare systems. Consequently, (34)__________and green areas as part of  their efforts to enhance public well-being.

Thành phần của cây trồng chứa bao nhiêu nguyên tố hóa học?

Nhiệm vụ, quyền hạn của chính quyền địa phương được xác định trên cơ sở nào?

Chủ thể sản xuất cần có trách nhiệm gì sau đây?

Tập hợp $C=\left\{\dfrac{1}{2};\dfrac{1}{6};\dfrac{1}{12};\dfrac{1}{20};\dfrac{1}{30}\right\}$ viết bằng cách chỉ ra tính chất đặc trưng của phần tử là

Thế nào là so sánh chuỗi?

Read the following advertisement 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 1 to 6.

"Welcome to FitLife Gym, the newest fitness center in town! We take pride in offering you a modern space equipped with state-of-the-art equipment and a team of expert trainers (1)______ to helping you achieve your fitness goals. At FitLife, we provide a variety of programs designed (2)______  all fitness levels, from beginners to advanced athletes.

Not only do we feature cardio and strength training areas, but we also offer yoga, pilates, and engaging group classes (3)______you motivated. With (4)______ you can easily choose the right plan that fits your schedule and lifestyle. At FitLife Gym, you'll experience the support of our dedicated team in a friendly and encouraging (5)______ . Join us today to kickstart your health journey and discover the difference that a supportive community can (6)______a difference in reaching your fitness aspirations!"

Nếu điện tích dịch chuyển trong điện trường sao cho thế năng của nó tăng thì công của của lực điện trường

Có nhiều vùng đất cao, đồi thoải xen với các thung lũng rộng hoặc vùng đất thấp là đặc điểm của khu vực địa hình nào?

Read the following passage about food addiction 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.

Few people would disagree that one of the world's most popular dishes is pizza. Twenty-two-year-old Zack certainly wouldn't. He would eat a variety of pizza-based items, including homemade pizza, precooked microwave pizza, and even pizza leftovers from the night before. He was consuming 800kg of pizza a year. As a child, Zack had eaten a wide variety of food. But he became addicted to pizza when he started secondary school. American school meals have often been criticised for the large amount of fast food present on the menu, and pizza is the star dish. Zack even spent all his pocket money on slices of pizza.

Naturally, Zack's family worried about his high-calorie, low-vitamin diet. So did Zack. In an attempt to break his addiction, Zack agreed to appear on a TV programme called Freaky Eaters. Its aim was to encourage food addicts to beat their addictions with the help of a psychologist and nutritionist. It wasn't easy. He had to eat a fish dish, while his brother sat in front of him enjoying... a pizza! However, Zack met the challenge and has never eaten pizza again.

Seventeen-year-old Stacy Irvine's friends visit her and discover that she has been rewarded thousands of free toys from fast food restaurants as a regular customer. Stacy's mother often gave her two-year-old girl a portion of fried chicken in a McDonald's restaurant. [I] Since then, Stacy has refused to eat anything else except for pieces of fried chicken, and as a result, her diet has created serious health. She has been warned that if she doesn't change her diet, she will die. [II] Stacy once collapsed due to lack of vitamins and nutrients and needed to be hospitalised. [III] She insisted that Stacy adopt a healthier lifestyle. However, worryingly, Stacy's mother said that while Stacy was beginning to understand the seriousness of her situation, she couldn't eat anything else but chicken nuggets. [IV]

Twenty-year-old Hanna Little was keen on chips. The only thing that Hanna consumed for fifteen years was one plate of chips after another. Not surprisingly, a diet that contained few nutrients and an excess of fat and carbohydrates could only have negative consequences. And it did because not only did Hanna develop health problems, but she also had to leave her job after collapsing at work. At five, Hanna became addicted to chips and refused to eat fruits and vegetables despite her mother's efforts. Hanna says that she was terrified of tasting the flavour of different types of food and she would feel anxious just at the idea of doing it. Parties, picnics and barbecues with friends and family used to be a nightmare. Furthermore, Hanna was soon seen as 'odd' by her friends' parents.

It wasn't until the age of sixteen that Hanna realised she had Selective Eating Disorder (SED). Despite this new knowledge, no solution was found. It wasn't until she lost her job before she started eating normally. Hanna sought therapy from psychologist Felix Economakis, who used hypnosis, a treatment that none of the doctors that she had seen before had mentioned, to get her to eat fruit after one one-hour session, and since then she has been willing to eat anything.... including chips!

(Adapted from Friends Global)

Which of the following is TRUE according to the passage?

Một người đi xe đạp chở thùng nước trên con đường lát bê tông. Cứ cách 3 m, trên đường lại có một rãnh nhỏ. Chu kì dao động (sóng sánh) riêng của nước trong thùng là 1,2 s. Để nước không bị sóng sánh mạnh nhất, vận tốc của xe đạp không thể bằng

Đồ thị biểu diễn mối quan hệ giữa gia tốc và vận tốc là 

Cho phản ứng: Br₂(l) + HCOOH(aq) \(\rightleftharpoons\) 2HBr(aq)  + CO₂(s).

Nồng độ ban đầu của Br₂ là aM, sau 50 giây nồng độ Br₂ còn lại là 0,02M. Tốc độ trung bình của phản ứng trên là 4.10-5M/s. Giá trị của a là