Phân loại
+ Căn cứ vào nhiên liệu chúng ta có các loại động cơ:
- Xăng.- Diezen.- Gas
+ Căn cứ vào số hành trình của piston chúng ta có các loại động cơ:
- 2 kì.- 4 kì.
về nguyên liệu ta phân ra ba loại động cơ: xăng, diezen, gas
vì số hành trình của piston ta phân ra hai loại động cơ: 2 kì, 4 kì
được chị dạy dạy đó ạ
cho câu trả lời hay nhất ạ
Có thể luộc chín quả trứng trong ly giấy được không? Vì sao?
. Listen and fill in the missing words Tim and Ba have been pen pals for (1) ______________ years. Last year Tim was invited to visit Vietnam. It was the (2)______________ time Tim went to Vietnam with his (3)__________ . When the plane landed at the airport, the weather was (4)______________ and there were a lot of people there. They (5) ______________ a taxi to a small hotel in the centre of the city. After (6) ______________ in, they went to their room on the (7) ______________ floor. Tim was eager to see the sight of the (8) ______________. II. Circle the best answer A, B, C or D 9. Would you mind if I _________ TV? A. watch B. watched C. watching D. watches 10. The man _________ next to me is very nervous. A. is sitting B. sits C. sitting D. sat 11. I _________ a friend while I _________ the shopping. A. met - was doing B. met - did C. was meeting – did C. was meeting - was doing 12. Vietnam is a(n)_________. A. rice exporting country B. rice - export country C. exporting - rice country D. rice - exporting country 13. She told me _________ speak English well. A. to how B. how to C. what to D. so as to 14. _________, dark clouds appeared and it began to rain. A. Fortunately B. Unfortunate C. Unfortunately D. Lucky 15. In the _________ festival, the fire is made in the traditional way. A. rice - cutting B. boat - sailing C. bull - fighting D. rice - cooking 16. We are looking forward _________ you in May. A. to seeing B. to see C. seeing D. to be seen Choose the word that has the underlined part pronounced differently from the others 17. A. tribe B. limestone C. minimize D. participate 18. A. emergency B. sugar C. gallery D. degree III. Read the text and answer the questions below Mai and Lan met each other ten years ago when they were both sixteen years old. They met each other in an evening English class when they had a comprehension lesson. Lan didn’t understand a word, so she asked Mai to help her and then they became close friends. They were together nearly everyday. They left school 2 years later. Then Lan went to the university but Mai didn’t. She married to a rich businessman and had two children. Lan continued to study for 4 years because she wanted to be a teacher. She had a lot of new friends but Mai is still one of her close friends. Now Lan is married and has a baby. She lives near Mai, so they meet very week. They often go for a walk in the park and talk about past things. * Questions: 19. How old were Mai and Lan when they met each other? …………………………………………………………………………………………………. 20. Where did they meet each other? …………………………………………………………………………………………………. 21. Did Mai go to the university? …………………………………………………………………………………………………. 22. Why did Lan continue to study for 4 years? …………………………………………………………………………………………………. 23. Are Lan and Mai close friends? …………………………………………………………………………………………………. 24. Do you have any close friends? …………………………………………………………………………………………………. IV. Write a story, using the following suggested words 25. Last week/ my class/ have/ day/ remember. 26. On the weekend/ we/ decide/ visit/ Con Son Pagoda. 27. When/ we/ come there, it/ start to rain/ heavily. 28. We/ have/ wait/ 5 hours/ before/ the rain/ stop. 29. Everyone/ be/ very hungry, so/ we/ have lunch. 30. After lunch/ we/ begin/ to visit/ pagoda. 31. Unfortunately/ it/ begin to rain/ heavily again. 32. When/ the rain/ stop, it/ be/ 5pm. 33. Everybody/ get/ really wet/ cold. 34. We/ decide/ leave/ pagoda/ without/ watch anything.
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Hòa tan hoàn toàn a gam hỗn hợp gồm Cu và Fe ( Fe chiếm 30% về khối lượng ) bằng 50ml dung dịch H2SO4 98% (d=1,4g/ml) . Sau khi phản ứng xảy ra hoàn toàn thu được chất rắn X nặng 0,75a gam, dụng dịch Y và 6,104 l SO2 (đktc). Tính khối lượng muối trong dung dịch Y.
Đốt cháy hoàn toàn Fe trong bình kín cần vừa đủ 5,04 lít hơi của một halogen, thu được 44,4 gam muối halogenua. Tìm tên của đơn chất halogen đó.
giúp mình với nha mọi người mong mọi người giúp mình nha
bài 1 : 17kg 28dag =... kg 3kg 84g =...kg 1206g =...kg 277hg =... kg 5 yến =... tấn 43kg =... tạ 46 hg =...kg 56,92 hg =...kg Bài 2 : điền dấu > ; < ; = a) 5kg 28g. ....5280g b) 4 tấn 21kg. ....420 yến Bài 3 7,3m =...dm 6,8m2 =...dm2 35,56m =...cm 3,14 ha =...m2 8,05km =..m 0,24 ha =...m2 6,38 km =...m 0,2 km2 =...ha
Smoking causes lung cancer, which is the number one cancer among men. Ninety percent of the people who get lung cancer die. Smoking is also the leading cause of mouth cancer, tongue cancer, and throat cancer. Many smokers have heart disease and pneumonia. Smoking causes one million early deaths in the world every year. Smokers not only harm themselves but also harm others. Smokers breathe smoke out into the air. They breathe *it* out on their children and their wives or husbands. Children whose parents smoke have more breathing and lung problems than other children. Women who are married to smokers are more likely to have lung cancer than those married to non-smokers. We are all aware that smoking is bad. So why do people smoke? 48.The number one cancer among men is____________. (1 Point) A. tongue cancer B. throat cancer C. lung cancer D. mouth cancer 49.The main cause of mouth cancer, tongue cancer and throat cancer is__________. (1 Point) A. drinking B. overeating C. breathing D. smoking 50.Every year, smoking causes about one million____________. (1 Point) A. cancer patients B. killing diseases C. early deaths D. injured men 51.The word *it* in the passage refers to____________. (1 Point) A. cancer B. smoke C. air D. breath 52.Who are more likely to have lung cancer and lung problems? (1 Point) A. People who live in the city B. People who live with smokers. C. People who live with non-smokers. D. People who live in the country. CẦN CHÍNH XÁC 100%
Giải thích ý nghĩa của câu:"Của người nhọc đổ mồ hôi, chớ vì tham đắm cướp về tay ta". (Dựa vào quyền sở hữu tài sản và nghĩa vụ tôn trọng tài sản của người khác để phân tích).
đặt các động từ trong ngoặc vào một thì phù hợp 1. You (clean).............. the room every day? 2. Anna (talk)............... on the phone to her penpal 3. You ever (be)............. to Paris, Mr. Lam? 4. Vinh usually (go)........... to school on foot 5. Mrs. Nhung (not take)....................the bus to work yesterday 6. You (meet)......... Hoang and Phuong two days ago? 7. Peter never (see) .............High School Musical before 8. They (not open).............the shop on Saturdays and Sunday
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