求高中化学常见的方程式

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• 1According to the passage, what problem does the recent research find？A．Sleep shortage has

  According to the passage, what problem does the recent research find？

  A．Sleep shortage has become a worldwide problem.

  B．Developed nations don"t pay enough attention to sleep.

  C．Sleep problems are more serious in developing countries.

  D．Lack of sleep is more obvious in developed countries.

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• 2American students usually get their high school diploma at the age of______.A．12B．17C．20D．

  American students usually get their high school diploma at the age of______.

  A．12

  B．17

  C．20

  D．24

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• 3高中化学所有重点方程式 帮忙写详情点 谢谢!
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• 4What responsibilities do states have concerning education？A．They must decide what certific

  What responsibilities do states have concerning education？

  A．They must decide what certificate teachers should have.

  B．They must pick out the suitable textbooks for students.

  C．They must make sure every child can receive education.

  D．They must provide enough funds for their schools.

  请帮忙给出正确答案和分析，谢谢！

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• 5高中化学最重要的二十个方程式是什么?
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• 6氰化氢中毒的毒作用特点是A、与血液中Hb结合，影响氧的运输B、血液中Hb虽被氧饱和，但不能被组织利用

  氰化氢中毒的毒作用特点是

  A、与血液中Hb结合，影响氧的运输

  B、血液中Hb虽被氧饱和，但不能被组织利用

  C、抑制体内多种酶的活性

  D、抑制胆碱酯酶的活性

  E、降低脑和肝中ATP酶的活性，使细胞缺氧

  请帮忙给出正确答案和分析，谢谢！

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• 7用化学法鉴别：乙醛酸 水杨酸 乙二酸 甲酸 丙酮酸 乙酸
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• 8高中化学,火法炼铜,湿法炼铜,高炉炼铁方程式
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• 9According to Kevin, most passengers______.A．don"t refuse to talk with the taxi driverB．kee

  According to Kevin, most passengers______.

  A．don"t refuse to talk with the taxi driver

  B．keep silent when they take me ride

  C．tell me driver how to go to me destination

  D．don"t make any choice as to how to go to me destination

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• 10当土壤粒径（)mm时，其通气性、透水性则逐渐减弱。A.＞0.1B.＜0.1C.＞0.01D.＜0.01

  当土壤粒径()mm时，其通气性、透水性则逐渐减弱。

  A.＞0.1

  B.＜0.1

  C.＞0.01

  D.＜0.01

  请帮忙给出正确答案和分析，谢谢！

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