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Cho a mol P2O5 vào 200 ml dung dịch NaOH thì thu được dung dịch chứa 0,15 mol Na2HPO4 và 0,25 mol NaH2PO4. Hãy xác định giá trị của a và nồng độ của NaOH.

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Câu hỏi: Cho a mol P2O5 vào 200 ml dung dịch NaOH thì thu được dung dịch chứa 0,15 mol Na2HPO4 và 0,25 mol NaH2PO4. Hãy xác định giá trị của a và nồng độ của NaOH. Lời giải tham khảo: Đáp án đúng: B NaOH+ H3PO4  →  NaH2PO4 + H2O  0,25              0,25            0,25 2Na OH + H3PO4  → Na2HPO4 + […]

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With drones and thermal cameras, Greek officials monitor refugees | Technology News – LLODO

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Athens, Greece – “Let’s go see something that looks really nice,” says Anastasios Salis, head of information and communications technology at the Greek Migration and Asylum Ministry in Athens, before entering an airtight room sealed behind two interlocking doors, accessible only with an ID card and fingerprint scan. Beyond these doors is the ministry’s newly-installed […]

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Question 46: Choose the correct answer A,B,C or D so that they have the same meaning as the original ones. Madeleine wears high heels to look taller.

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Question 46: Choose the correct answer A,B,C or D so that they have the same meaning as the original ones. Madeleine wears high heels to look taller. A. In order to look taller, Madeleine wears high heels B. So that to look taller, Madeleine wears high heels. C. Madeleine wants high heels to make her […]

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Sentence 29: Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions. There is always conflict between parents and children. However, they still should talk and share things with each other.

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Sentence 29: Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions. There is always conflict between parents and children. However, they still should talk and share things with each other. – Question and Answer English online Link Hoc va de thi […]

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Question 45: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. The future of the African elephant depends on man. No (1)….. can human beings and wild animals live in harmony throughout vast area of ​​the continent as was possible in days gone by, for man’s needs have increased as well as his numbers. There are regions, such as the Congo forests and the equatorial Sudan, (2)………. the old relationship may remain for a few more years or even generations, but in general it has gone. Conservation, if it is to be effective, should be a positive, constructive policy, and it is wishful thinking to imagine otherwise, (3)…. in the case of the elephant. And this is not yet true of the whole of Africa, it soon will be, for the increase in the human population is almost universal. Where human beings and wild animals find themselves in competition with each other, the animals will (4)……. Even if there appears to be enough room for both, man will not tolerate long a situation in which elephants and other (5)………. make even occasional raids on his fields of food or economic crops. For many years this has been a major cause of conflicting interests and one of the reasons why so many elephants have been shot to control their numbers. (first)……………………….

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Question 45: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. The future of the African elephant depends on man. No (1)….. can human beings and wild animals live in harmony throughout […]

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Question 47: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Keeping fit and healthy may seem difficult, but there are a few easy-to-follow guidelines. First, a balanced diet is absolutely essential. This (1)……. selecting food that is low in salt and sugar. Experts recommend reducing the amount of fat in your diet, as too much can lead to heart problems. They also suggest increasing the (2)……of high fiber food we eat. This comes in the form of fresh fruit, vegetables, whole meal bread and pasta. As well as being packed with vitamins and minerals, they are delicious too. Secondly, it’s important to fit exercise into your daily(3) ….. _This can be done by simply walking as much as possible and climbing stairs instead of taking the lift. Exercise is necessary to maintain a healthy body, as well as increasing energy levels and (4) …… you feel generally fitter and happier. Finally, staying relaxed is important for good health. Too much stress can lead to a variety of illnesses, from headaches to high blood pressure. (5) ……… possible, do things you enjoy and treat yourself occasionally. So the message is simple- enjoy yourself but learn to respect your body too. It’s all a question of getting the balance right. (4)……………………….

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Question 47: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Keeping fit and healthy may seem difficult, but there are a few easy-to-follow guidelines. First, a balanced diet is absolutely essential. […]

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DXC Technology Co. stock outperforms market on strong trading day – LLODO

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Shares of DXC Technology Co.DXC,+1.91%advanced 1.91% to $32.57 Thursday, on what proved to be an all-around great trading session for the stock market, with the S&P 500 IndexSPX,+0.62%rising 0.62% to 4,725.79 and the Dow Jones Industrial AverageDJIA,+0.55%rising 0.55% to 35,950.56. This was the stock’s third consecutive day of gains. DXC Technology Co. closed $11.61 below […]

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