Tại sao chuẩn UTF-8 được dùng thay thế tiêu chuẩn mã hóa ký tự ASCII? A. UTF-8 chỉ sử dụng 128 giá trị. B. ASCII không thể biểu diễn biểu tượng cảm xúc. C. UTF-8 có thể lưu trữ một ký tự trong nhiều hơn một byte. D. ASCII có thể lưu trữ một ký tự trong nhiều hơn một byte.

2 câu trả lời

Đáp án `:`   

 `C,UTF-8` có thể lưu trữ một ký tự trong nhiều hơn một byte.

`----------`

Giải thích `:`   

 Vì một ký tự được mã hóa theo `UTF-8` có độ lớn từ `1` byte `-` `4` byte. Trong khi đó ký tự được mã hóa theo `ASCII` thì chủ yếu độ lớn là `7` bit. Nhưng do ngày nay , số lượng các ký hiệu thường dùng trong ngôn ngữ tự nhiên, trong toán học,... càng lớn hơn nhiều so với bảng mã `ASCII` `128` ký tự nên chúng ta cần một bảng mã lớn hơn, các ký tự có độ mã hóa lớn hơn để có thể biểu diễn các ký tự còn lại.

`->` Chuẩn `UTF-8` được ra đời và thay thế tiêu chuẩn mã hóa ký tự `ASCII`

`->` Chọn `C,UTF-8` có thể lưu trữ một ký tự trong nhiều hơn một byte.

⇒ Ý A nha 

 - Vì ASCII đã được mở rộng thêm 8 bit cho các ngôn ngữ khác, không phải tiếng Anh, nhưng 128 số điểm mã bổ sung có sẵn của bản mở rộng này sẽ được ánh xạ tới các ký tự khác nhau tùy thuộc vào ngôn ngữ được hiển thị .

                     Cho mik xin vote, cám ơn, câu trả lời hay nhất với ạ                          

Câu hỏi trong lớp Xem thêm

A. Read the passage and choose the best answer (A, B, or C) to the following questions (5 pts) My name is Hoa. Here is a photo of my school. It is a big school. It is in Hue. It is on Nguyen Hue Street. In my school, there is a big yard and there are a lot of trees around it. My school has three floors and forty classrooms with 1,700 students. My classroom is on the second floor. I‟m in grade 7, class 7A. Our class starts at 7.00 and finishes at 11.30. At school we learn many things, but I like Literature and English best. I also like Music, Sports and Art. We often have recess at 9.20. We usually drink, eat and talk at recess. We sometimes play games like blind man‟s bluff or catch. We often make much noise at recess. After school, we often go home and have lunch at 12.30. 1. Where is the school? A. On Nguyen Hue Street B. In Hue C. On Nguyen Hue Street in Hue 2. How many students are there in the school? A. 1,700 B. 1,070 C. 1,007 3. When does the class start and finish? A. 7.00 and 11.00 B. 7.30 and 11.00 C. 7.00 and 11.30 4. What subjects does she like best? A. Literature and English B. Literature and Art C. English and Music 5. What does she usually do at recess? A. Drinks and eats B. Drinks, eats and talks C. Eats and talks VII. Reading B. Read the passage and choose the best answer (A, B, or C) to the following questions (5 pts) What do you often do after school? In my school, there are a lot of clubs which students can take part in after school hours. The club that has the biggest number of members is the swimming club called “Blue Dolphins”. I myself love swimming so I am a member of this club. I go to the swimming pool twice a day and swim for about an hour. I‟m really interested in swimming breaststroke because it helps me move as fast as I can. I‟m also fond of backstroke. I swim backstroke when I want to relax, breathe and let my body float freely. It‟s very relaxing. The second club I would like to mention is the charity club. Its name is “Golden Heart”. Members of the club often do community service. This month, they are conducting a clean-up campaign to protect the environment around the school. They collect trash, clean the toilet area, and grow plants. I am not a Golden Heart‟s member, but I participate in their activities whenever I can. If you can sing, dance or play musical instruments, the musical club “Heartstrings” is definitely for you. The president of the club is Mike, my best friend. He is not only good-looking but also sings beautifully and plays the guitar very well. In conclusion, we should do as many activities as possible in our free time to have good health and a fresh mind to prepare for lessons in class. Spending all our time studying is not a good idea. 6. The writer is interested in swimming breaststroke because ________ A. it makes him relaxed B. it helps him swim as fast as he can C. it helps him stay healthy D. it is the easiest swimming style 7. The writer is fond of backstroke when ________ . A. he has a competition B. he is hot C. he is tired D. he want to relax 8. This month, Golden Heart's members ________ . A. clean classrooms, halls, and the toilet area B. grow plants, water flowers C. help elderly people D. collect trash, clean the toilet area, and grow plants 9. The musical club “Heartstrings” is definitely for the students who ________ . A. can sing and dance B. can sing, dance, and play musical instruments C. can write songs D. can cook 10. Spending all the time studying is ________ . A. unnecessary B. necessary C. good D. important

4 lượt xem
2 đáp án
4 giờ trước