Cho một mạch logic như sau:
Với p = 01110101 và q = 10101101, phương án nào sau đây nêu đúng giá trị của R?
Câu hỏi liên quan
Phát biểu nào sau đây không đúng?
Trong 10 năm đầu sau khi thành lập (1967 - 1976), hợp tác kinh tế của tổ chức ASEAN
Một gen ở sinh vật nhân sơ, trên mạch 1 có %A - %X = 10% và có %T - %X = 30%; trên mạch 2 của gen có %X - %G = 20%. Theo lí thuyết, trong tổng số nucleotit trên mạch 1, số nucleotit loại X chiếm tỉ lệ bao nhiêu?
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions.
The Amazon rainforest is home to more than a third of all the world's species of plants, birds and animals. Twenty per cent of all the birds in the world live in the rainforest. Scientists have discovered thousands of types of plants and animals that can only be found there. There are thousands - probably millions more that we haven't discovered yet. There are at least 2.5 million species of insects there. Imagine what would happen if they all lost their home? It couldn't happen, could it? Unfortunately, it's happening right now. Yet, the rainforest is big. But it's getting smaller. The problem is that people are cutting down the trees, mainly to make room for cows. These provide meat and make money for their owners. This process of cutting down trees is called ‘deforestation'.
The good news is that it is slowing down. In 2004, for example, more than 27,000 square kilometres were cut down. That's an area bigger than Wales. In 2006, because of all the campaigns to save rainforest, it dropped to just over 13,000 square kilometres. The bad news is that it's not enough. Scientists predict that by 2030, the rainforest will have become smaller by 40%. It's possible that by the end of the 21st century, the rainforest will have completely disappeared. With deforestation, thousands of the animals, birds, fish and plants that live in the Amazon rainforest lose their home, their natural habitat. Some of them move to other areas, but most of them die. Many species have already become extinct, and many more will if deforestation continues. That will change the balance of life in the rainforest and could cause enormous problems to the region's ecosystem.
There's another problem too. Trees and plants are a vital source of oxygen. If we cut them down, we lose that oxygen. But it's worse than just that. With deforestation, the trees and plants are burnt. This sends gases into the Earth's atmosphere, which stops some of the Earth's heat escaping. That then leads to the temperature here on the ground going up. This increase in the world's temperature is called 'global warming', and most scientists believe it's a very serious issue. If they stopped deforestation, it might help prevent global warming
Which title best summarises the main idea of the passage?
Nửa sau thế kỉ XIX, chủ nghĩa tư bản chính thức được xác lập ở
Nguyên tố boron có 2 đồng vị: \({}_5^{10}B\) chiếm 18,89% số nguyên tử và \({}_5^{11}B\) chiếm 81,11% só nguyên tử. Nguyên tử khối trung bình của boron là
Cho hàm số \(y=\frac{x-1}{2x-3}\) \(\left( C \right)\).
Trong lĩnh vực quân đội, quốc phòng, Hồ Quý Ly tiến hành cải cách nào sau đây?
Cho một mạch logic như sau:
Phương án nào sau đây là mệnh đề của mạch logic?
Cơ sở của hình thức sinh sản ở sinh vật đơn bào và sinh sản vô tính ở sinh vật đa bào là quá trình gì?
Dãy bit 101110010 là thể hiện dạng nhị phân của số thập phân nào sau đây?
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
As the company is trimming its sails to overcome the economic crisis, its employees may have to do without a summer vacation trip.
Biết là độ dịch chuyển 3 m về phía đông còn là độ dịch chuyển 4 m về phía bắc. Hãy xác định độ lớn, phương và chiều của độ dịch chuyển tổng hợp
Lớp vỏ đại Dương được cấu tạo chủ yếu bởi tầng đá
Yếu tố nào sau đây không ảnh hưởng đến lượng cầu hàng hóa, dịch vụ trên thị trường tiêu dùng?
Vật liệu cấu tạo vỏ Trái Đất gồm thành phần chủ yếu:
Để thể hiện sự khác nhau về khối lượng hoặc tốc độ di chuyển của đối tượng địa lí trên bản đồ, các mũi tên thường có đặc điểm:
Cuộc Cách mạng Tân Hợi ở Trung Quốc (năm 1911) đã
1. Do you find yourself yawning all day at school? You probably need more sleep. However, it is not just how much sleep you get that is important. What you do before bedtime also has a huge effect on how you feel the next day. If you spend time chatting to someone on social media, or reading a book on your e- reader, you are not alone.
2. All devices' screens give out a large amount of blue light, which affects the body's production of the sleep hormone, melatonin, which can change your sleep patterns. So it is not just getting to sleep that becomes hard, but the quality of your sleep also suffers. The result is that you can wake up several times during the night, and have difficulty getting up in the morning.
3. Sleep is food for the brain, so not sleeping well can be a severe problem for anyone, especially for teenagers, because their brains are still developing. When you do not sleep well, it can be difficult to concentrate at school, which makes it harder to learn and get good grades. It can also affect your mood, making you feel sad or anxious.
4. So, it is clear you should not use your phone before you go to sleep. Why not leave it in another room? Nothing on social media is so important that it cannot wait a few hours! You should rediscover paper books and enjoy feeling tired and sleepy before bedtime rather than wondering why your best friend has not liked your photo! How will you wake up? You do not have to use the alarm on your phone. Go and buy yourself an old-fashioned alarm clock! The negative effects that screen time is having on sleep have been in the news a lot recently, so manufacturers of smartphones and tablets have added a feature to the mobile devices that can help reduce these. Most new phones have a night-time setting that changes the colour of the screen so that it gives out less blue light. If you really cannot avoid going onto social media at bedtime, think about turning on this setting on your phone.
Why does the author mention the sentence "How will you wake up?"?
A father will be his child's role model. He will be the example for his child of what husbands and fathers are like.
