8g oxit của 1kim loại M hóa trị 2 tác dụng hoàn toàn với 98g dung dịch H2SO4 10%.Hãy xác định công thức hóa học của oxit kim loại M.

5m vuông 3dm vuông hỏi bạn bằng mấy

He ____ for London one year ago. A. left B. has left C. leaves D. had left She ____ in Hue for twenty years. A. lives B. has lived C. lived D. will live I ____ to the market with my mother yesterday. A. go B. went C. have gone D. was going What ____ you ____, Nam? – I’m thinking of my mother. A. do/think B. are/thinking C. have/thought D. were/thinking How long ____ you ____ her? – For five months. A. do/know B. are/knowing C. have/known D. had/known I usually ____ to school by bus. A. went B. am going C. go D. have gone Yesterday morning I ____ up at 6.30. A. got B. get C. was getting D. had got Please don’t make so much noise. I ____. A. studying B. study C. am studying D. studied Water ____ at 100 degrees Celsius. A. boils B. boiled C. is boiling D. will boil It is raining now. It began raining two hours ago. So it ____ for two hours. A. rains B. is raining C. has been raining D. rained ____ you ____ out last night? A. Did/go B. Do/go C. Have/gone D. Were/going This house ____ 35,000 pounds in 1980. A. costs B. cost C. had cost D. was cost While Tom ____ tennis, Ann ____ a shower. A. played/took B. playing/taking C. was playing/was taking D. was play/was take I ___ the book by the time you came here last night A. finish B. finished C. had finished D. was finishing When they ____ in the garden, the phone rang. A. worked B. were working C. have worked D. are working They ____ tea when the doorbell ____. A. have/is ringing B. were having/rang C. had had/ rang D. having/ringing Father ____ his pipe while mother ____ a magazine. A. smoked/read B. had smoked/read C. was smoking/was reading D. smoking/reading When I ____ into the office, my boss was waiting for me. A. came B. was coming C. had come D. come When I saw Brian, he ____ a taxi. A. drives B. was driving C. drove D. is driving When he ____, we ____ dinner. A. arrived/having B. arrived/were having C. was arriving/had D. had arrived/had

Bài 8: Tính bằng cách thuận tiện nhất: a) 36,4x 99 + 36+0,4 b) 77,28x 20,2 + 23,72 x 20,2 – 20,2 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. c) 1,25 x 59,7 x 800 d) 2,5 x 46 + 54 x 2,5 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

phân tích tính đúng đắn và sáng tạo trong tư tưởng hồ chí minh về độc lâp dân tộc và chủ nghĩa xã hội

1. nêu sự khác nhau giữa thực vật ưa sáng và ưa bóng 2. cho ví dụ về vận dụng ảnh hưởng ánh sáng tới đời sống sinh vật vào trong thực tiễn sản xuất 3. trong hai nhóm sinh vật hằng nhiệt và biến nhiệt sinh vật thuộc nhóm nào có khả năng chịu đựng cao với sự thay đổi nhiệt độ của môi trường 4. hãy so sánh đặc điểm khác nhau giữa nhóm cây ưa ẩm và chịu hạn

lim ( 3.2^n - 5^n )...................

1.Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. (A) According to a team of scientists, (B) there are evidence (C) that Mount Everest is still (D) rising. A:A B:B C:C D:D 2.Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions. How can scientists predict earthquakes? Earthquakes are not scattered anywhere but happen in certain areas. They happen in places where pieces of the Earth"s surface meet. For example, earthquakes often occur on the west-coast of North and South America, around the Mediterranean Sea, and along the Pacific coast of Asia. Another way to predict earthquakes is to look for changes in the earth’s surface, like a sudden drop of water level in the ground. Some people say animals can predict earthquakes. Before earthquakes, people have seen chickens sitting in trees, fish jumping out of the water, snakes leaving their holes and other animals acting strangely. After an earthquake happens, people can die from lack of food, water, and medical supplies. The amount of destruction caused by an earthquake depends on where it happens, what time it happens, and how strong it is. It also depends on types of buildings, soil conditions and population. Of the 6000 earthquakes on the earth each year, only about fifteen cause great damage and many deaths. The amount of destruction caused by an earthquake does not depend o A:where it happens B:types of building C:what time it happens D:air condition 21Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. A:opposition B:affirmative C:understanding D:exhibition 22Mark letter A, B, C or D on your answer sheet to indicate the meaningful sentence from the cues given.The case/be/ so heavy/ Nam/ could/put/ on the rack/. A:The case was so heavy that Nam could not put it on the rack. B:The case was so heavy that Nam could put it on the rack. C:The case was such heavy that Nam could not put it on the rack. D:The case was heavy that Nam could not put it on the rack. Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. (A) At the moment I am (B) spending my weekend (C) go to (D) camping with my friends. A:A B:B C:C D:D 27 Mark letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions. Please don’t touch the things on display. A:Would you mind if I didn’t touch things on display? B:Would you mind not touching things on display? C:Would you mind touching things on display? D:Would you mind if I touched things on display?

khoáng sản là gì? Thế nào là mỏ khoáng sản,mỏ nội sinh,mỏ ngoại sinh giúp mik với

viết một đoạn văn khoảng 200 chữ trình bày suy nghĩ của em về ý nghĩa của lối sống uống nước nhớ nguồng