Phong trào cách mạng 1930-1931 đã để lại bài học kinh nghiệm nào sau đây cho sự nghiệp giải phóng dân tộc ở Việt Nam? 

Cho 2 số thực dương \(a, b\) thỏa mãn \(a+b=5 a b\). Khẳng định nào sau đây là khẳng định đúng ?

Cơ cấu GDP phân theo khu vực kinh tế của các nước phát triển có đặc điểm như thế nào?

Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

The explosion in mobile phone use around the world has made some health professionals worrieSome doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't agree.

What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

What is the word “potentially” in paragraph 4 closest in meaning to?

Xác định: Đặc điểm nào thuộc về môi trường nhân tạo ?

Read the following passage about studying abroad 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.

Successful students often do the followings while studying. First, they have an overview before reading. Next, they look for important information and pay greater attention to it (which often needs jumping forward or backward to process information). They also relate important points to one another. Also, they activate and use their prior knowledge. When they realize that their understanding is not good, they do not wait to change strategies. Last, they can monitor understanding and take action to correct or “fix up” mistakes in comprehension.

Conversely, students with low academic achievement often demonstrate ineffective study skills. [I] They tend to assume a passive role in learning and rely on others (e.g., teachers, parents) to monitor their studying. [II] For example, low-achieving students often do not monitor their understanding of content; they may not be aware of the purpose of studying; and they show little evidence of looking back or employing “fix-up” strategies to fix understanding problems. [III] Students who struggle with learning new information seem to be unaware that they must extend effort beyond simply reading the content to understand and remember it. [IV] 

Children with learning disabilities do not plan and judge the quality of their studying. Their studying may be disorganized. Students with learning problems face challenges with personal organization as well. They often have difficulty keeping track of materials and assignments, following directions, and completing work on time. Unlike good studiers who employ a variety of study skills in a flexible yet purposeful manner, low-achieving students use a restricted range of study skills. They cannot explain why good study strategies are important for learning; and they tend to use the same, often ineffective study approach for all learning tasks, ignoring task content, structure or difficulty.

Which of the following can be inferred from the passage?

Ngôn ngữ lập trình là?

Cho phương trình lượng giác \(3-\sqrt{3}\text{tan}\left( 2x-\frac{\pi }{3} \right)=0\).

Chuyển động Brown có thể quan sát được trong các môi trường nào sau đây?

Cho thông tin sau:

Các nước có trình độ phát triển kinh tế cao và ổn định sẽ có nhiều khả năng và cơ hội sớm thoát ra khỏi cuộc khủng hoảng và nhanh chóng khôi phục nền kinh tế. Nhưng một khi các nước đang phát triển vẫn còn trong vũng lầy, sự phục hồi của các nước phát triển cũng sẽ vô cùng gian nan.

(Nguồn: Tạp chí Ban Tuyên giáo Trung ương)

Nhận định nào dưới đây là đúng/sai?

Nhóm A bao gồm các

Với một tụ điện xác định, nếu hiệu điện thế giữa hai đầu tụ tăng 2 lần thì năng lượng điện trường của tụ

Quốc khánh nước Cộng hoà xã hội chủ nghĩa Việt Nam là ngày nào?

Cấu hình electron của nguyên tử ₂₄Cr là

Giá trị nghệ thuật của đoạn trích là gì?

Người ta tiến hành khảo sát các yếu tố ảnh hưởng đến lượng khí \(\mathrm{CO}_{2}\) thu được trong một khoảng thời gian xác định từ phản ứng giữa đá vôi với dung dịch HCl 1 M. Trong điều kiện thí nghiệm nào dưới đây, lượng khí \(\mathrm{CO}_{2}\) thu được là lớn nhất?

Hoa Kì có cơ cấu dân số như thế nào?

Cho hai tập hợp $M=\left[ -4;7 \right]$ và $N=\left(-\infty ;-2 \right)\cup \left(3;+\infty \right)$. Khi đó $M\cap N$ bằng

Chú thích trích dẫn là gì?