Đáp án:
Giải thích các bước giải:
Sản xuất từ đá vôi sau đó nung nóng
CaCO3--to>CaO+CO2
Sản xuất $ CaO$ trong công nghiệp từ đá vôi
$CaCO_3 \xrightarrow[]{t^\circ} CaO + CO_2$
Giúp mình bài này với!!! Bài từ vuông góc đến song song nha!
Viết các câu sau với mệnh đề if (1,2,3) 1.It was raining. That's the only reason I didn't take the children to the beach. =>If.... 2. When I bought this house I didn't realize that in summer planes skimmed the roof every five minutes.(If I (knew)...I(not buy)etc.) =>If.... Nhờ mn giúp mik
Phân tích các đa thức thành nhân tử x ² - 2xy + y + 3x - 3y - 10
Mọi người giúp mình bạn này nhé
III. Choose the word / phrase (A, B, C or D) that best fits the space in each sentence: 1. The Ao dai is the __________ dress of Vietnamese women. A. national B. stylish C. casual D. traditional 2. __________ can fashion designers modernize the Ao dai? A. What B. Why C. How D. Where 3. In some industries workers have to wear masks __________ work. A. at B. on C. in D. with 4. What is your favorite type of clothing __________ special occasions? A. at B. from C. in D. on 5. The work of a __________ is to give advice on how and what to wear to people. A. stylist B. clothes maker C. clothing maker D. fashion designer 6. Schools look more colorful and __________ when students wear casual clothes. A. living B. lively C. alive D. live 7. Young __________ always has different opinions on fashion compared with adults’ ones. A. generation B. inspiration C. women D. students 8. It’s terrible. He __________ those jeans for a week. A. wore B. has worn C. was wearing D. wears 9. Yellow __________ you, but the blouse doesn’t __________ the skirt. A. matches / suit B. suits / fit C. suits / match D. fits / match 10. Ân: “What do you think of the Hanbok, Korean traditional costume?” Bình: __________. A. You like it. B. I will wear it. C. I like it. D. I think of it very much. 11. Nhi said that she __________ wearing long-sleeved blouses. A. love B. loves C. loved D. has loved 12. No new styles of jeans __________ since their last performance. A. has been made B. have been made C. are made D. were made 13. Jeans started __________ 200 years ago. A. wear B. to wear C. wearing D. to be worn 14. There is no need __________ of what to wear every day. A. think B. to think C. thinking D. to be thinking 15. Children in Central highlands of Vietnam used to be __________ Korean actors and actresses. A. summed up B. worn out C. named after D. tried on 16. We should always __________ our students to try their best all the time. A. match B. embroider C. encourage D. persuade 17. Women are often the __________ for his songs. A. inspiration B. occasion C. generation D. conclusion 18. Wearing casual clothes at school doesn’t make students feel __________ to one another. A. unique B. equal C. convenient D. logical 19. What __________ would you like, silk or cotton? A. symbol B. label C. material D. style 20. How long __________ the Ao dai? - Since 1995. A. have you painted B. did you paint C. were you painting D. do you paint 21. __________ she __________ printing lines of poetry on the Ao dai in 2000? A. Has / begun B. Did / began C. Was / beginning D. Did / begin 22. Nam: Why should secondary school students wear uniform at school? Lan: __________. A. Because it is convenient. B. Because it is cheap. C. Because it makes students feel comfortable. D. Because it makes students feel equal in many ways. Giúp mình với ạ
Cho tam giác ABC có độ dài ba cạnh là a$\leq$ b$\leq$ c. CMR : $(a+b+c)^{2}$ <9bc
Làm giúp tui phần e nhé, mấy phần còn lại tui làm xong rồi. Sợ mn nhìn không được đề nên tui viết đề ra nè Cho tam giác ABC nhọn có AB<BC, đường cao BK. MN là hình chiếu của K trên AB, BC. Chứng minh: a)BM.BA=BN.BC b)Tam giác BMN đồng dạng với tam giác BCA c)Góc BNM=góc BAC d)Tứ giác AMNC có tổng 2 góc đôi bằng 180 độ e)MN cắt AC tại D. Chứng minh: DM.DN=DA.DC
1) They reported that a troop were going to the front. ->A troop... 2)Minh is a more skillful tennis player than Chi ->Minh plays... 3)Does your brother use the Internet every day? ->Your brother... 4)Paul needs to cut the grass in the garden ->The grass..
Cho tỉ lệ thức a/b=c/d.Chứng minh rằng a-c/b-d=a+c/b+d.C ơn nha
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