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nguyentien56t
2 năm trước
Muốn biến dung dịch NaCl bão hòa thành dung dịch chưa bão hòa ta có thể sử dụng biện pháp nào sau đây * 3 điểm A. Hạ thấp nhiệt độ B. Thêm nước vào C. Thêm NaCl vào D. Khuấy dung dịch
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Giải giúp mình với làm nhanh ạ : Large cities often have problems that small towns and rural areas do not have. Two of the biggest problerms are heavy traffic and the pollution that cars create. Of course, traffic problems and pollution are not only found in big cities. However, the higher populations and larger number of cars on the roads in cities can make the problems happen more often and with more noticeable effects. Öne of the most common traffic problerms that large cities have is congestion. As the population of a city increases, so does the number of cars on the road. Cities cannot always improve the number and size of their roads and highways to keep up with the number of cars. The result is traffic congestion, or traffic jams. When traffic jams happen, cars that are stuck in the congestion continue to run their engines. This creates pollution and is a big problem. Pollution causes health problems for the people in cities and also hurts the environment.

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