Có thể điều chế ancol etylic từ:
+ Etilen $C_2H_4$
+ Tinh bột $(\kern-6pt-C_6H_{10}O_5-\kern-6pt)_n$ hoặc glucozơ $C_6H_{12}O_6$
tìm một số , biết rằng nếu lấy số đó trừ đi trừ đi số bé nhất có ba chữ số khác nhau thì được số bé nhất có ba chữ số giống nhau
Người ta truyền tải công suất điện 10MW bằng đường dây tải điện có điện trở dài 105m.Hiệu điện thế đường dây tải điện là 100kW. a)Tính công suất điện b)Tính Php c)Tính hiệu điện thế cuối đường dây d)Hiệu suất của quá trình truyền tải điện
Bài tập 1: Cho hình thức đúng của tính từ và trạng từ trong những câu sau: 1- The ___________ (old) he gets, The _____________ (bad-tempered) he becomes 2- The ___________ (much) he works, the ___________ (bad) he felt 3- The ____________ (much) we think of the exam, the ___________( excited ) we get 4- The ___________ (busy) the road gets, the ___________(dangerous) it becomes 5- The ___________ (near)you get to the Equator, the ___________ (hot) it becomes. 6- The ___________ (long) she stay in England, the ___________ (good) her Englishwill be. 7- The ___________ (fast) I write, the ___________ (illegible) my writing becomes 8- The ___________ (well) she sings, the ___________ (much) she is admired 9 - The ___________ (long) he waited , the ____________ (impatient) he became 10 - The ____________ (large) the apartment, the_____________ (expensive)the rent. Bài tập 2: Cho hình thức đúng của tính từ và trạng từ trong những câu sau: 1. A steak knife is ______________________ (sharp) than a butter knife. 2. David is the _______________________ (fast) player on the team. 3. My drawing is _______________________ (colorful) than yours. 4. I think the book we read today is _____________________ (interesting) than the one we read yesterday. 5. This week's temperatures are _____________________ (warm) than last week’s. 6. He plays the guitar _________________ (well) as Andrés Segovia. 7. That was the ______________________ (difficult) test I've ever taken. 8. Isn't he the _____________________ (nice) little boy you've ever met? 9. Do you think a snake is _____________________ (slow) than an owl? 10. The ___________ (early) we leave, the sooner we arrive. 11. Robert's arms are _____________________ (long) than John's. 12.Joe has the _____________________ (big) feet of anyone in his family. 13. The colder the weather gets, ______________ (sick) I feel. 14. Nobody is ______________ (happy) than Maria. 15. Messi is the _______________ (good) football player in the world. 16. The queue was getting ____________ (long) and _____________ (long). 17. ______________ (young) you are, ____________ (quickly) you learn. 18. _______________ (good) the weather is, _____________ (crowded) the beaches get. 19. Maria speaks French _________________ (fluently) than Julia. 20. This is the ________________ (bad) thing I”ve ever had. Bài tập 3: Chọn câu trả lời đúng. 1. She considers him __________ person that she has ever met. A. most attractive B. more attractive than C. as attractive D. the most attractive 2. The __________ I got to know you, the _________ I understand you A. most; least B. more; less C. much; little D. most; less 3. Lan is the _________ of the three brothers. Tan is his _________ brother. A. younger; older B. youngest; older C. younger; eldest D. youngest ; eldest 4. The ___________ the speech, the ____________ the people got. A. longer; more sleepy B. longest; sleepy C. long; most sleepy D. longest; most sleepy. 5. The teacher said that I had done my work ______ than anyone else in class. A. worse B. bad C. worst D. as bad 6. Maria is ______ than her sister. A. much pretty B. more pretty C. much more pretty D. prettier. 7. The president is ________ than he looks . A. little nervous B. more nervous C. as nervous D. most nervous 8. The economic conditions today are____________ they were in the past. A. the best than B. much better C. much more good D. much better than 9. That was _______ delicious meal I’ve ever had for a long time. A. the most B. the more C. the less D. the little 10. Jim didn’t do _______ in his examination as he has hoped. A . more well B. most well C. so well D. less well 11. The situation was much _________ than we expected. A. worse B. badder C. worst D. gooder 12. The ________ accident in the history of the city occurred last night on the Free way. A. worse B. badest C. worst D. most bad 13. He ran ________ than his friends. A. fast B. very faster C. more fast D. faster 14. Peter likes Mathematics _________ English. A. more B. more good than C. the most than D. better than. 15. Their house is _______ beautiful than mine. A. as B. more C. much D. so
a,50+100.657+100 b,1+2+3+4+5+6+.....+97+98+99+100
nhà nước đầu tiên của nước ta ra dời vào thời gian nào
Viết đoạn văn ngắn tả cảnh bác hồ ở tức cảnh pác bó sử dụng câu cầu
có 3 bình đựng riêng biệt các chất khí N2 O2 H2 . Hãy nhận bt các chất khí bằng phương pháp hóa học
Hãy tính thành phần phần trăm mỗi nguyên tố trong công thức H2O
mội người lm hộ mình bài 2 với đang cần gấp
Cho C=$\frac{3}{4}$+ $\frac{8}{9}$ $\frac{15}{16}$+...+$\frac{9999}{10000}$ Chứng minh rằng C > 98.
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