Giải thích các bước giải:
Do A⊂BA⊂B nên nếu X⊂A⇒X⊂BX⊂A⇒X⊂B
Do đó ta chỉ cần tìm tập còn của tập A
Tập con của A gồm: ∅;{1};{2};{1;2}∅;{1};{2};{1;2} có 4 tập thỏa mãn
=> ĐÁP ÁN B
Giữa 2 đại phân tử axit nuclêic và protein thì đại phân tử nào quan trọng hơn với cơ thể hơn? Vì sao
Ai giúpppp mk dơia ạ môn gdcd ạ
Xác định parabol y = axmũ2 + bx + c biết parabol đạt giá trị lớn nhất bằng 1/4 khi x bằng 3/2 và tổng lập phương các nghiệm của phương trình y=0 bằng 9 giúp mình với ạ mình đang cần rất gấp ạ
Nguyên nhân thất bại, ý nghĩa lịch sử của các phong trào đấu tranh ở Ấn Độ. Giúp me vs!!
1. This basket was woven very ___ by a famous artisan. SKILL 2. We very often only come to appreciate someone or our ___ with them when we lose them. RELATE 3.A foreign ___ bought the artwork for three hundred thousand dollars. BUSINESS 4. The museum is doing tests to determine the __ of the painting. AUTHENTIC 5. The artifacts are arranged __ from primitive life to CHRONOLOGY modern times. CHRONOLOGY 6. Many foreign ___ bought Vietnamese conical hats as souvenirs. TOURISM 7. There is a big ___ of handicrafts made by different craft villages. COLLECT 8.Would you like to visit a place ___ for its scenery or a well-known historical site? FAME 9. A fun-filled night of karaoke was provided as___ for all of the guests. ENTERTAIN 10. The village is a recognised ___ spot and has been used as a film location. BEAUTIFUL
Nêu những điều hiểu biết của em về Ôxygen
1. Long ago, people used to ________ the sun, the stars and the moon. A. hate B. worship C. love D. dislike 2. The living room and the dining room are ________ by a short wall where there are many decorative plants. A. broken B. divide C. parted D. separated 3. The material used to make jeans was very ______ and it did not wear out easily. A. hardly B. difficult C. strong D. solid 4. Writers are usually inspired with beauty. They write ______to show their feelings. A. novels B. poems C. text reading D. essays 5. Try these cakes. They are made _______ wheat flour, sugar, butter and eggs. A. of B. in C. by D. from 6. You remind me ______ your uncle. We used to work ______ each other. A. of – to B. of – with C. with – for D. for - with 7. I knew Jane _______ I was a child. A. as B. until C. during D. through 8. – Can I smoke here? - I’d rather you ________. A. don’t B. didn’t C. can’t D. couldn’t 9. - __________________!” - “Thanks. I’ll write to you as I come there.” A. Good luck next time C. Have an interesting trip B. Have nice weather D. God bless you 10. Today young generation is still _________on wearing jeans. A. fond B. interested C. proud D. keen
giúp em với nhé đọc đoạn văn và chọn câu trả lời đúng As computers have become powerful tools for the rapid and economic production of picture, computer graphics has emerged as one of the most rapidly growing in fields in computer science. "It" is used routinely in such diverse areas as business, industry, art, government, education, research, training and medicine. One of the initial uses of computer graphics, and ultimately its greatest use, has been as an aid to design, generally referred to as computer-aided design (CAD). One of its greatest advantages is that designers can see how an object will look after construction and make changes freely and much more quickly than with hand drafting. For three-dimensional rendering of machine parts, engineers now rely heavily on CAD. Automobile, spacecraft, aerospace, and ship designers use CAD techniques to design vehicles and test their performance. Building designs are also created with computer graphics systems. Architects can design a building layout, create a three-dimensional model, and even go for a simulated "walk" through the rooms or around the outside of the building. Business graphics is another rapidly growing area of computer graphics, where it is used to create graphs, charts, and cost models to summarize financial, statistical, mathematical, scientific, and economic data. As an educational aid, computer graphics can be used to create weather maps and cartographic materials. Computer art also has creative and commercial art applications, where it is used in advertising, publishing, and film productions, particularly for computer animation, which is achieved by a sequential process. 1. The paragraph following this passage would most likely be about ............ a. cost models b. computer animation c. flight training d. application of CAD in medicine 2. According to the passage, engineers use CAD to ......... a. advertising b. a simulated "walk" through model rooms c. rendering machine parts d. making cost models 3. What does the passage mainly discuss? a. Computers as the architects of the future b. Routine uses of computers c. The rapidly growing field of computer science d. Computer graphics applications 4. According to the passage, architects use CAD to ......... a. make cartographic materials b. create graphs c. create three-dimensional models d. inspect buildings 5. The word "It" in line 2 refers to .......... a. computer graphics b. production of picture c. computer d. computer science
Complete these following sentences using an-ing or to+infintive froms of the verbs in the brackets. 1.I decided....(change) jobs because my boys makes me work overtime. 2. I finish ...(read) the book and sent to bed. 3.Would you mind...(keep) queit for a moment? 4.The childer are looking forwad to...(see) their grandparents again. 5.We must do something.We can't go on...(live) like this. 6.Please don't make so much noise.I'm trying....(finish) my homework. 7.Will yoy plcase stop....(change) TV channels? 8.Sheila seems...(have) some difficult problems. 9.Let's stop...(watch) so much TV so that we can read or go out instead. 10.Don't forget...(post) the letter i gave you.
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