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daovanduc20061999
2 năm trước
$\text{1 trong 2 mạch đơn có tỉ lệ A : T : G : X = 15% : 30% :}$ $\text{30% : 25%}$ $\text{L = 0,306 Nm → 3060Å}$ $\text{1, Tính tỉ lệ % và số lượng từng loại Nu của mỗi mạch đơn}$ $\text{ và của cả Gen.}$ $\text{2, Tính số chu kì xoắn, khối lượng của Gen.}$ $\text{3, Tính liên kết H$_2$, liên kết hóa trị của Gen.}$
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Many people still believe that natural resources will never be used up. Actually, the world’s energy resources are limited. Nobody knows exactly how much fuel is left. However, we also should use them economically and try to find out alternative sources of power. According to Professor Marvin Burnharm of the New England Institude of Technology, we have to start conserving coal, oil and gas before it is too late; and nuclear power is the only alternative. However, many people do not approve of using nuclear power because it’s very dangerous. What would happen if there was a serious nuclear accident? Radioactivity causes cancer and may badly affect the future generations. The most effective thing is that we should use natural resources as economical as possible. Statements T/F 1. Natural resources will run out. 2. The world’s energy resources are unlimited. 3. We know exactly how much fuel is left. 4. We should use fuel economically. 5. According to Professor Marvin Burnham, nuclear power will be used as a substitute for natural resources. 6. Many people disagree to use nuclear power as an alternative energy. 7. Radioactivity from nuclear power causes cancer and may have bad effect on the future generations. 8. Natural resources should be used as economical as possible.

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