Cho tam giác ABC có BC=6cm. Lấy D điểm chính giữa của AC. Kéo dài AB một đoạn BE=AB ,Nối D với E. DE cắt BC tại M. Tính BM

Cho hỗn hợp A gồm CO2 và N2 có tỉ lệ thể tích tương ứng là 3:2 Tính tỉ khối của hỗn hợp khí A đối với không khí Tính thể tích( đktc) của 18,8 gam khí A

Viết chữ : nóng như cái lò NL : chỗ các pác có mưa chx

1.Nối hai quả cầu A và B bằng dây dẫn người ta thấy êlêctron dịch chuyển trong dây dẫn theo chiều từ A đến B. Kết luận nào sau đây là đúng khi nói về điện tích của hai quả cầu A và B? A nhiễm điện âm, B nhiễm điện dương A không nhiễm điện, B nhiễm điện âm. A nhiễm điện dương, B không nhiễm điện A nhiễm điện dương, B nhiễm điện âm. 2.Trường hợp nào sau đây, đổi đơn vị đúng? 220V = 0,022KV 1200V = 1,2KV 50KV = 500000V 4,5V = 450mV 3.Trong đoạn mạch 2 bóng đèn mắc nối tiếp có cường độ dòng điện qua bóng đèn 1 là I1= 1A, Hỏi cường độ dòng điện qua đèn 2 bằng bao nhiêu? I = 0,5A I = 1A I = 1,5A I = 2A 4.Để đo được dòng điện trong khoảng 0,10A - 2,20A ta nên sử dụng ampe kế có ĐCNN và GHĐ như nào? 0,2A-2A 0,01 A-3A 0,1 A-2A 0,3A-3A

Nam went to the party yesterday, B. doesn't he C. didn't he D. did the A. does he 15 Choose the word whose underlined part is pronounced differently from that of the others. C. hotel A. house B. heritage D. hour 16. Choose the word which has a different stress pattern. A. channel B. father C. teacher D. cartoon

Trong câu: "Còn lá buồm thì cứ căng phồng như ngực người khổng lồ đẩy thuyền đi." có mấy quan hệ từ?

Word form 1 Forest fires start_____ during the drought (easy) 2 Underground cables carry ____to all parts of the town (electric) 3 If area is _____ all the tree there are cut down or destroyed ( deforest) 4 He streets are filled with a ______ atmosphere when Tet comes(joy) 5 He takes a cold ______ every morning(bathe) 6We call the sun and all the planets moving around it the ____system(sun)

Giúp em với ạ em cần gấp :(( Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. Every day on radio, on TV, and in the newspaper, we hear, see or read about many problems in the world, for example, pollution problems. Air pollution is the first kind. It mostly comes from fumes released from motorbikes, cars, airplanes, trains and poisonous gases emitted from factories. Also, waste is dumped anywhere, even in the city where many people are living. The second pollution problem is sea pollution. Many people earn their living from fishing in the sea, and the fish they catch feed many people. But the sea has become so polluted from oil spills and factory wastes that the fish are dying. This is not only killing the fish, but is also affecting those people who eat fish. Seldom do you find a place nowadays that is not polluted. This problem is growing more difficult every day. We must find a good solution that makes the world a better place to live. Question 21. We hear, see and read about problems in the world _________ A. once a week​B. every day​​C. every week​D. every year Question 22. What causes the air pollution? A. fumes from vehicles.​B. poisonous gases from factories. C. waste from everywhere​ D. All are correct Question 23. The sea has become polluted because of _________ A. oil spills​B. factories wastes C. smoke from factories​D. A and B are correct Question 24. In order to make the world a better place to live, we _________ A. should not prevent pollution​B. must find a good solution. C. should kill the fish.​D. None is correct. Question 25. The word “This” in the passage refers to _________ A. pollution ​B. oil ​C. factory​D. sea Read the following passage and mark the letter A, B, Cor D to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30. Coronavirus germs live in people’s throats and mouths. When someone who has the coronavirus coughs or sneezes or breathes out, the germs come (26) ________ their mouth in tiny drops of water. Though you can’t see the germs, you can sometimes see these tiny drops. In cold weather, they make a cloud of steam! So if someone else (27) ________ breathes in the air with the coronavirus germs in it, they would probably get the illness. It’s easy to get the coronavirus germs from inside your body on your hands (28) ________ you touch your nose or your mouth. If the person with the coronavirus germs on their hands uses a door, the invisible germs can live on the handle for hours. When someone else opens the door, they (29) ________ the germs on their hands too. And if they touch their nose or mouth, the germs can get into their body. So you (30) ________ also catch the coronavirus by touching things that someone with the virus has already touched. Question 26.A. into​ B. out of​ C. to​ D. because of Question 27.A. accidentally B. generally C. decisively​D. usually Question 28.A. what​ B. when​ C. which​ D. unless Question 29.A. make​ B. bring​ C. get​ D. search Question 30.A. should B. need​ C. must​ D. can

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