Cho Al dư vào 400 ml dung dịch HCl 1M rồi dẫn khí sinh ra đi qua ống đựng 40g bột CuO dư nung nóng thì thu được 11,52 g Cu. a. Tính hiệu suất phản ứng khử CuO b. Tính khối lượng chất rắn còn lại trong ống sứ

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các cậu ưi giúp mình với mình sắp phải nộp rồiiii

giup minh bai 22 nhe ban nao lam duoc minh vot 5 *****

1. “Can I have a new bicycle?” said Ann to her mother Ann asked 2. “Where has he been?” She doesn’t know that She doesn’t know 3. “I’m sorry that I broke the glass”, said Peter Peter apologised 4. “How long has it been since you left this city, Bob?” He wanted to know 5. “Why didn’t I get a computer before?”, thought the officer manager The officer manager wondered 6. “Where is the station car-park?” Mrs. Smith asked Mrs. Smith asked 7. “How old is your little boy?” said the nurse to Mrs. Bingley The nurse asked 8. “I think you should go by train” He told us He advised us 9. “How many stars are there in the sky?” No one knows giúp mik vs

Read the passage and fill in the blank with a suitable word. How a conical hat is made? Nowadays, people in Viet Nam use hats (1) …………. from cloth or plastic but many people still prefer (2) ……………. hats made from leaves. They say it’s (3) ……………. comfortable and cooler to wear conical hats. A (4) ……conical…………. Hat looks simple but (5) ………………. hat makers have to follow 15 stages, from going to the forests to collect special leaves, choosing the quality ones, drying and ironing (6) ………………. to make frames. Conical hats always have two layers of leaves. Hat makers must be very skillful to make the (7) ………………. layers very thin. In Hue, the artisans make special conical hats by adding poems (8) ………………. pictures of Hue between the two layers to create famous Bai tho or poetic conical (9) ………………. Making conical hats now represents one of the (10) ………………. crafts of Viet Nam.

Task 1. Complete the sentcnes with must, mustn’t or needn't. (Điền các câu với must (phải làm gì), mustn't (cấm) hoặc needn’t (không cần) 1. DOCTOR: You……….go on a diet; but you …………..eat sensibly and you…………. overeat. 2. ZOO NOTICE: Visitors……………. feed the animals. 3. TEACHER: You…………………. read the whole book but you…………. read the first four chapters. 4. RAILWAY NOTICE: Passengers……………..walk on the line. 5. SCHOOL NOTICE: The lifts…………… be used in case of fire. 6. DOCTOR: You ……………. take more than two of these pills at once. Three might be fatal. 7. DOCTOR (to patient’s wife): If the pain has gone, he ..................... take any more of these.

|x-2|=3 (CHUYỂN ĐIỂM ĐẤY ĐỪNG TRẢ LỜI)

một cái ao hình tam giác có chiều cao là 14m và cạnh đáy gấp dôi chiều cao . Tính diện tích cái ao đó ? 147m2 14,7m2 14,7dm2 147dm2

zào năm học đến nơi rùi mới lo đi mua sách mà h ko bt mua sách vt hãng nào mn cho mình xin sách hãng nào mà giấy 80gsm đc ko tl dễ đc hn hơn á calli : Klong mơn trc