Sau thất bại trong phong trào "Đồng khởi" (1959 -1960 ) ở miền Nam, Mĩ đã chuyển sang chiến lược A: “Việt Nam hóa chiến tranh”. B: “Chiến tranh đơn phương”. C: “Chiến tranh đặc biệt”. D: “Chiến tranh Cục bộ”.

4334,56m2=.............................................................................dam2

Vẽ cho mình ảnh của fairy tai, nhường cho bạn hoang jeany nhé

người ta muốn truyền đi một công suất điện là 400MW từ nhà máy thủy điện đến khu dân cư cách đó 65m. Biết cứ một km dây dẫn có điện trở là 0,01Ω. a) Hiệu điện thế giữa hai đầu dây tải điện là 500kv. Tính công suất hao phí do tỏa nhiệt trên đường dây. b)Nếu cứ để hiệu điện thế ở hai cực của máy phát là 11kv mà truyền đi thì công suất hao phí là bao nhiêu.

............ Bài 3...................

(x+1)+(x+2)+...+(x+1000)=5750 5sao bạn nào giúp mình đầu tiên nha đầy đủ nha ......

Giúp mình câu 3 nhanh vote 5 sao

Em hãy vẽ sơ đồ mạch điện gồm có 2 bóng đèn D1 và D2; nguồn điện; 3 khóa K1,K2 và K3; dây dẫn vừa nối đủ. Biết: -Khi K3 đóng, K1 và K2 hở thì cả 2 đèn đều sáng -Khi K3 hở, K1 và K2 độc lập đối với nhau thì D1 và D2 tắt hay sáng tùy ý

Một bình chứa hỗn hợp khí X gồm 0,8g H2 ; 2,24 lít khí N2 và 5,6 lít khí CO2 (ở đktc). Tổng số mol các khí trong hỗn hợp khí X là A: 0,55 mol. B: 0,6 mol. C: 0,65 mol. D: 0,5 mol.

READING SKILLS * Fill each numbered blank with one suitable word to complete the passage. Nowadays, more and more people are changing the way they use their televisions. Some years ago we (1)..... to turn on T.V and watch whatever there was. But now we choose the programs we watch (2)..... more carefully because we have many (3)..... interesting things to do. One result of this change is that we are also becoming (4)..... careful about the actual television set itself. As we watch fewer programs, we want to be sure that we will (5)..... a really good picture, with bright color and clear sound. Because it will be swiched off (6)..... of the time, we also want the television to look good when we are not watching it. So when we (7)..... or rent we look at the outside to make sure it is attractive and will look right (8)..... other funiture. Of course, we have to pay more (9)..... high quality. However, it seems that the number of people (10)..... are content to do so is increasing and this should have a good result, because in the end all televisions will have better quality. *Fill in each blank with a suitable word to complete the following passage. Freddy liked to go to the countryside to draw animals and plants. One day, while (1)..... across a field, looking for rabbits to draw, he was so lost in thought that he did not (2)..... a bull running towards him. About a hundred meters (3)..... was a tree under which he usually sat to draw. Suddenly, he heard a (4)..... noise behind him. It was a bull! He knew that a bull could run much (5)..... than a man, but he also knew that a bull could not see very (6)..... and noticed only shape and movement. To distract the bull, he threw his bag away (7)..... him. The bull saw the sudden movement and headed for the bag. Freddy quickly climbed (8)..... the tree and watched the bull attact his bag. (9)..... the bull was satisfied and had gone away, he got down from the tree and ran (10)..... fast as he could. Everything in the bag was completely ruined. *Read the passage carefully and then answer T(true) or F(false): Large cities like New York, Mexico and Tokyo have problems with crowded streets, congested traffic, noise and air pollution. Everyday thousands of vehicles fill the streets, especially during rush hours. The large number of cars and trucks cause so much congestion. No vehicles can move any direction and no one can get anywhere. Parking is another problem. There are not enough facilities. and when cars try to park on the streets,there is not enough room for traffic. Finally, the traffic adds to the problems of air and noise pollution. 1.  During rush hours, there is a lot of traffic in large cities. 2.  Different kinds of vehicles cause so much congestion. 3.  It’s easy to find room for parking in big cities. 4.  Vehicles make air in large cities polluted. 5.  Crowded streets, congested traffic, noise air pollution are problems in big cities. 6.  During rush hours, hundreds of vehicles fill the streets.