thủy phan hoàn toàn 444 gam 1 lipit thu dc 46 gam glixerol và 2 loại axit béo hai loại axit béo đó là A) C15H31COOH VÀ C17H35COOH B) C17H33COOH VÀ C17H35COOH C) C17H31COOH VÀ C17H33COOH D) C17H33COOH VÀ C15H31COOH

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Tìm x ( x - 2 ) ³ = ( x - 2 ) ²

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240 marbles were shared between some boys and 3 girls. The number of marbles that the girls had was 3/8 of the total number of marbles. (a) Find the number of marbles each girl had. (b) If each boy had 25 marbles, how many boys were there?

Làm ơn giúp đỡ vots 5sao vs cảm ơn

ĐỀ KIỂM TRA HỌC KỲ II SỐ 4 I. Look and write the correct words. There is one example. climb fall off cut yourself run down get a burn roll off Example: You go up a tree or the stairs with your feet and hands. climb 1. You hurt yourself with a knife. ________ 2. You drop yourself from something like a bike or a tree. ________ 3. You hurt yourself by touching very hot things like fire. ________ 4. You go down very fast. ________ 5. You fall off a bed or a sofa ________ II. Read and number the sentences in the correct order. The conversation begins with 0. A Nam: Which one is more beautiful, Ha Noi or Ho Chi Minh City? B Linda: I went to Ho Chi Minh City. 0. C Nam: Where did you go last weekend, Linda? D Linda: Well, it’s a modern city, but a bit noisier than Ha Noi. E Nam: Oh, really! What do you think of Ho Chi Minh City? F Linda: I think they are both beautiful in their ways. III. Read and fill each gap with one word from the box. Write the word next to the number. There is one word that you do not need. There is one example (0). city supermarkets river plane boats fine markets Can Tho is a big (0) city in the South of Viet Nam. People often go there by coach or by (1) ___________. Can Tho Bridge is a beautiful place to look down the wide and long (2) _________ and the landscape on the banks. There are beautiful floating (3) ___________on the rivers in Can Tho. People sell fruits, vegetables, meat or fish from their (4) __________. Can Tho is a beautiful city, and the weather is always (5) ___________. In the rainy season, it can be quite wet. IV. Look at the pictures and the example. Read the story and write the word(s) for each gap. There is one example (0). 0. 1. 2. 3. 4. 5. Last summer I went to Da Lat with my (0) classmates. It’s a beautiful city in the Centre of Viet Nam. We went there by (1) __________. It’s smaller than Ho Chi Minh City, and quieter. The weather was fine. It was colder and drier than in Ha Noi. We stayed in a (2) __________. It’s opposite a big (3) __________. We visited famous places such as Prenn Waterfall and Langbiang (4) __________. The food was cheap, but the clothes were expensive. I enjoyed the trip so much. It was more exciting than I expected. After Da Lat, I would like to visit Phu Quoc (5) __________ some day. V. Order the words. There is one example. Example: bigger / Ha Noi / is / Hue / than Ha Noi is bigger than Hue. 1. is / than / more / exciting / Da Nang / Ho Chi Minh City ______________________________________________________. 2. quieter / is / Da Lat / Can Tho / than ______________________________________________________. 3. is / than / modern / more / New York / Tokyo ______________________________________________________. 4. is / which / larger / Paris / London / one / or __________________________________ ,___________________?

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cuộn dây của một biến trở con chạy được làm bằng hợp kim nikêlin có điện trở suất 0,4.10^-6 ôm mét, có tiết diện đều là 0,6mm^2 và gồm 500 vòng quấn thành 1 lớp quanh lõi sứ trụ tròn đường kính 4cm a)tính điện trở lớn nhất của biến trở này b) hiệu điện thế lớn nhất được phép đặt lên 2 đầu cuộn dây biến trở là 67V . hỏi biến trở này chịu được dòng điện có cường độ lớn nhất là bao nhiêu?