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Trong tự nhiên lưu huỳnh có hai đồng vị bền là 32S và 34S với % về số nguyên tử lần lượt là 95% và 5%. Tính khối lượng 34S trong 14,445 gam lưu huỳnh.
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1. Studies show that having good conflict skills is associated with various positive outcomes. a. resolutional b. resolving c. resolve d. resolution 2. For most of us, however, positive thinking and can be learned. a. self-awareness b. self-abuse c. self-access d. self-analysis 3. He asked her to marry him but she . a. carry him out b. turned him down c. took him out d. let him in 4. The cost living in Singapore is higher than any countries in South East Asia. a. for b. on c. of d. in 5. I met James in a restaurant on Friday and he said that he had seen Caroline there . a. the day before b. this day c. today d. that day 16. Jane said that she come and look after the children the following day. a. can b. will c. could d. should 7. The weather was in England than in Spain last week. a. most warmer b. by far warmer c. more warmer d. much warmer 8. all our efforts to save the school, the authorities decided to close it. a. Since b. Despite c. Although d. Because 9. He still doesn’t know his budget when living alone in the city. a. when to manage b. how to manage c. where to manage d. what to manage 10. A: “I really don’t like shopping around the holidays.” B: “ . It’s always so busy.” a. I couldn’t agree with you more. b. I like it. c. I don’t like it. d. No, it’s not that.

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