Chọn một từ/ cụm từ mà nghĩa của nó KHÔNG cùng nhóm với các từ/ cụm từ còn lại.

Xác định khi nói về riboxom phát biểu nào không đúng?

Tính chính xác cao trong lĩnh vực cơ khí:

Nitrogen là nguyên tố dinh dưỡng quan trọng cho sinh vật, tuy nhiên hàm lượng nitrogen cao

có thể gây ô nhiễm nước. Một nghiên cứu xác định hàm lượng ion ammonium (NH\(_4^+\)) trong nước bề mặt ở Đồng bằng Sông Cửu Long và so sánh với tiêu chuẩn (hàm lượng NH\(_4^+\) < 3 mg L\(^{-1}\)) theo nguyên tắc sau:

- Chuẩn bị mẫu thử bằng cách pha loãng mẫu nước 10 lần.

- Ion NH\(_4^+\) được chuyển thành indophenol qua các phản ứng:

Cường độ màu (đậm nhạt) của dung dịch A tỉ lệ thuận với lượng indophenol trong dung dịch.

Khi đó máy đo cường độ màu có thể tính toán được hàm lượng indophenol, từ đó tính được hàm lượng NH+4 trong mẫu đo. Kết quả cho thấy hàm lượng ion NH\(_4^+\) trong mẫu thử là 1,44 mg L\(^{-1}\).

Các phản ứng cần thực hiện ở điều kiện pH trong khoảng từ 4 đến 13. Thiết bị chỉ đo được mẫu nước có hàm lượng NH\(_4^+\) nằm trong khoảng từ 0,26 đến 10,30 mg L\(^{-1}\).

(Tham khảo G.-J. Wilbers, M. Becker, L. T. Nga, Z. Sebesvári, and F. G. Renaud, "Spatial and temporal variability of surface water pollution in the Mekong Delta, Vietnam," Science of the Total Environment, vol. 485-486, pp. 653-665, Jul. 2014, doi: 10.1016/j.scitotenv.2014.03.049)

Từ kết quả thí nghiệm, một số phát biểu được đưa ra như sau:

(a) Hàm lượng nguyên tố nitrogen cao trong nước có thể dẫn đến hiện tượng phú dưỡng, làm tăng nồng độ oxygen (\(O_2\)) hoà tan trong nước và gây ô nhiễm.

(b) Hàm lượng nguyên tố nitrogen tồn tại ở dạng \(NH_4^+\) trong mẫu thử trên là 1,12 mg L\(^{-1}\).

(c) Kết quả trên chứng tỏ lượng \(NH_4^+\) trong nước có nguồn gốc từ phân bón trên các đồng ruộng lân cận.

(d) Kết quả trên khẳng định được nitrogen trong nước không tồn tại ở dạng nitrate (\(NO_3^-\)).

Phát biểu nào là đúng?

Cho \(\text{sin}\alpha =\frac{1}{3}\) với \({{90}^{\circ }}<\alpha <{{180}^{\circ }}\).

Cho mạch điện với 2 rơ le K1 và K2. Mạch điện sau đây thực hiện phép toán logic 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)

The phrase addicted to in paragraph 1 could be best replaced by _____.

Sự kiện đánh dấu sự mở rộng của cách mạng tư sản ra bên ngoài châu Âu là:

Trong trường hợp dưới đây, các cơ sở sản xuất đã thực hiện chức năng gì của thị trường?

"Vào mùa khai trường, các cơ sở sản xuất đã đầu tư theo công nghệ in ấn mới để có thêm những sản phẩm văn phòng phẩm sinh động, hữu ích phục vụ thị trường sử dụng bút, thước, tập vở học sinh tại địa phương".

Mệnh đề nào sau đây đúng?

Nguyên lí máy Turing ra được công bố năm nào?

Trong mặt phẳng \(Oxy\), đường thẳng \(\left( d \right):\,\,ax + by + c = 0,\,\,\,\left( {{a^2} + {b^2} \ne 0} \right)\). Vectơ nào sau đây là một vectơ pháp tuyến của đường thẳng \(\left( d \right)\)?

Mệnh đề nào sau đây đúng?

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.

Living Every Moment Fully: Secrets to Happiness in the Digital Era

Are you seeking balance in your life? The (1)_________ balance between online and offline worlds awaits you!

Our modern (2)_________ create unnecessary daily life stress in our increasingly connected world. Stolen moments (3)_________ your phone during important conversations add up to lost time. We should remind people (4)_________ the value of being present together.

The secret (5)_________ in finding your perfect digital-life harmony through mindful technology use. Start prioritizing real connections today (6)_________ your life into something meaningful.

Contact us now at Digital Wellness Center for your free consultation!

Công nghệ khử nước được ứng dụng cho bảo quản

Trong quá trình tiêu dùng, khi sản phẩm tiêu thụ được sẽ thúc đẩy

Read the passage carefully. Choose an option (A, B, C or D) that best answers each question from 23 to 30.

1. How do children learn about wildlife? And is what they learn the sort of thing they should be learning? It is my belief that children should not just be acquiring knowledge of animals but also developing attitudes and feelings towards them based on exposure to the real lives of animals in their natural habitats. But is this happening?

2. Some research in this area indicates that it is not. Learning about animals in school is often completely disconnected from the real lives of real animals, with the result that children often end up with little or no understanding or lasting knowledge of them. They learn factual information about animals, aimed at enabling them to identify them and have various abstract ideas about them, but that is the extent of their learning. Children's storybooks tend to personify animals as characters rather than teach about them.

3. For direct contact with wild and international animals, the only opportunity most children have is visiting a zoo. The educational benefit of this for children is often given as the main reason for doing it but research has shown that zoo visits seldom add to children's knowledge of animals – the animals are simply like exhibits in a museum that the children look at without engaging with them as living creatures. Children who belong to wildlife or environmental organizations or who watch wildlife TV programmes, however, show significantly higher knowledge than any other group of children studied in research. The studies show that if children learn about animals in their natural habitats, particularly through wildlife-based activities, they know more about them than they do as a result of visiting zoos or learning about them in the classroom.

4. Research has also been done into the attitudes of children towards animals. It shows that in general terms, children form strong attachments to individual animals, usually their pets, but do not have strong feelings for animals in general. This attitude is the norm regardless of the amount or kind of learning about animals they have at school. However, those children who watch television wildlife programs show an interest in and affection for wildlife in its natural environment, and their regard for animals in general is higher.

What is the word "disconnected" in paragraph 2 closest in meaning to?

Nhận định nào sau đây là thể hiện vai trò của nhân sách nhà nước?