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fanbjyx
2 năm trước
Tại sao Silic không tan trong axit HF(đặc) hoặc HNO3(đặc) nhưng chỉ tan trong hỗn hợp axit HF(đặc) và HNO3(đặc).
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Bài 14: Đọc đoạn văn sau và trả lời câu hỏi: The nomadic life of Mongolian Mongololian people nowadays still maintain their tradition of a nomadic life. About half of mongolian population do not settle down but travel from place to place every season. When you think of Mongolian nomads, you think of animal farmers. Their most valuable possessions are their tents and cattle. Mongolian has severe weather. There are dramatic changed in weather condotions between seasons. That is the reason why Mongolian have to move location throughout the year to the most appropriate spots. In winter, they often move in front of a mountain for shelter. In spring, it’s closer to a river, in summer right next to a river for water supply, and in autumn up a hill to collect hay for winter time. Most nomads move at least four times a year but some might move up to 30 times in a year ,especially if they have a lot of animals that eat through the vaibable food quickly. The number of namads has, however, significantly decreased over last years. More and more of its citizens move to Ulaanbaatar because they want to look for an education and a professional job.Mongolia is in a period of rapid change. 6.Why more and more Mongolian move to Ulaanbaatar?

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