Khi cọ xát thước nhựa vào mảnh dạ, nhận định nào sau đây đúng: a/ Thước nhựa bị nhiễm điện còn mảnh dạ không nhiễm điện. b/ Thước nhựa và mảnh dạ đều bị nhiễm điện. c/ Thước nhựa chỉ nhiễm điện khi cọ xát lâu vào mảnh dạ.

qua hình ảnh cánh chim,chòm mây cho thấy dự tương đồng với hình ảnh người tủ ntn

Read the following passage then answer the questions by circling the letters A, B, C or D. There was a time when parents who wanted an educational present for their children used to buy a typewriter, a book or a dictionary. Convinced that computers are the key to success, parents are insisting that children should be taught to use them in school as early as possible. They tend to fear that their children will be unemployable if they haven't mastered computer technology. The use of computers in school is becoming more and more widespread. However, many teachers welcome computers, while others remain reluctant. They argue that using computers in studies is a waste that "too much money is going for computerized educational materials". However, it is widely agreed that children should be taught computer programming, which does more develop their problem-solving skills and ability to think systematically. 16. The purpose of the author when he writes the above passage is____________. A. to explain the important of the early introduction of computers to school. B. to present the different ideas of parents about spending money on computers. C. to complain about the over-use of computers in school. D. to prove that using computers in studies is a waste. 17. Which of the following statements is true according to the passage? A. Parents fear that their children will waste much money on studying computers. B. Parents suggest that their children should study how to use computers early in school. C. Teachers are not interested in the educational value of computers. D. Teachers should learn how to use computers early. 18. Why do parents want their children to master the computer technology? A. Because they want their children to be computer experts. B. Because they are convinced that computers are best tools. C. Because they fear that their children will be unable to obtain a job. D. Because they don't want to be unemployable. 19. According to the passage, the students' skills of solving problems and their ability to think systematically can be developed by__________. A. studying how to use computers. B. using computers in studies. C. computerizing educational materials. D. studying computer programming in school. 20. The best title for the passage is__________. A. An Education Present B. Computers, a waste of money C. Educational Values of Computers D. Computers and Parents

Làm Giúp Mình Với!! Từ bài Bàn luận về phép học của La sơn phu tử Nguyễn Thiếp, hãy suy nghĩ về mối quan hệ giữa học với hành

lim(2020x^6+ √3x^5+4x^4+1230x^3×4200x^2+1000x+800)×sin500×600+2345)^2

Tìm phân số a/b bằng 21/28, biết a >0, b>0 và ƯCLN(a,b)=15

2x -3=0 Ax+(a-1)y=3/2 Tim a de he Phuong trinh co nghiem duy nhat

Though they don’t attend the meeting, they know the content. ---> In spite of

từ văn bản nước đại việt ta viết đoạn văn 5-7 câu nói lên niềm tự hào dân tộc.trong đó có sử dụng câu nghi vấn theo 2 kiểu đã học

ai giải giúp mik câu này với ạ mik cảm ơn