Hãy tìm công thức hóa học đơn giản nhất của một loại oxit sắt, biết trong oxi này có 7 phần khối lượng của sắt kết hợp với 2 phần khối lượng oxi

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Cho tập E={0,1,2,3,4,5,6,7} có thể lập bao nhiêu số tự nhiên có 5 chữ số sao cho: a) chữ số 1 có mặt đúng 2 lần, các chữ số khác có mặt ko quá 1 lần. b) chữ số 1 và 2 có mặt đúng 2 lần. c)các chữ số khác và chia hết cho 3. Mình cần gấp lắm ạ

Câu 26: This plant’s …. is high, so it attracts a lot of investment. A. production B. productivity C. products D. produce Câu 27: The ……. of this machine requires the latest techniques. A. production B. productivity C. products D. produce Câu 28: This energy - …. bulb is not cheap. A. save B. saved C. saving D. savoury Câu 29: The …. are requiring us to repair the machines. A. consume B. consumer C.consumption D. consumers Câu 30: Watching Korean films on TV is a time - …. activity. A. consume B. consumer C. consumption D. consuming Câu 31: Water …. is increasing this summer. A. consume B. consumer C. consumption D. consuming Câu 32: The …. of the model attracts us. A. efficiency B. effect C. efficient D. effectively Câu 33: They are working ….., so we are ….. A. effective, satisfactory B. effectively, satisfactory C. effectively, satisfied D. effective, satisfied Câu 34: Life always needs a lot of …... A. innovate B. innovator C. innovation D. B&C Câu 35: Why are you so …….. of his work? He's just doing his best. A. critic B. critical C. criticize D. criticism Câu 36: It's her ….. obligation to tell the police what she knows. A. immoral B. moral C.morality D. morally Câu 37: Tet is the most important ….. in Vietnam. A.celebrate B.celebration C.celebrating D. celebratory

People in cities all over the world shop in supermarkets. Who decides what you buy in the supermarket? Do you decide? Does the supermarket decide? When you enter the supermarket, you see shelves full of food. You walk in the aisles between the shelves. You push a shopping cart and put your food in it. You probably hear soft, slow music as you walk along the aisles. If you hear fast music, you walk quickly. The supermarket plays slow music. You walk slowly and have more time to buy things. Maybe you go to the meat department first. There is some meat on sale, and you want to find it. The manager of the supermarket knows where customers enter the meat department. The cheaper meat is at the other end of the meat department, away from where the customers enter. You have to walk by all the expensive meat before you find the cheaper meat. Maybe you will buy some of the expensive meat instead of meat on sale. 36. The author asks if you decide ________ in supermarkets. A. how to buy B. what to buy C. the things sold D. when things are sold 37. In the supermarket, there ________. A. is a shopping cart B. are full shopping carts C. places with food D. are shelves food 38. What separates shelves in supermarkets? A. the place near the entrance B. the space between shelves. C. the space at once side of the supermarket. D. the space between the upper and lower shelves 39. According to the passage, music can ________ customers. A. motivate B. tell the mood of C. have an effect on D. make customers happy 40. Which of the following is NOT true about supermarkets? A. They play soft and slow music. B. They put cheaper meat near the entrance C. They want their customers to buy expensive meat D. Customers do not have to listen to fast music. Cả nhà giúp mig với mig cần gấp làm nhanh giúp mig