下列关于纸上层析法的叙述，错误的是 A．纸上层析法分为上升

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问题选择题

下列关于纸上层析法的叙述，错误的是

A．纸上层析法分为上升纸层析法和径向纸层析法

B．纸上层析法适用于分离和检验化学性质十分接近的分子或离子

C．它利用试样中的各种离子随展开剂在滤纸上展开的速率不同而达到分离目的

D．只有有色离子的检验才能用纸上层析法，否则无法看到色斑

答案

答案：D

填空题

根据句意及首字母提示补全单词，使句意完整

1. Look at the map, can you s_____ China on it?

2. A panda(熊猫) is b______ and w______.

3. W_______ to our store.

4. He can't a______ a new house.

5. He w______ a yellow car.

6. There are many clothes on s______.

7. You must do your things y______.

8. I can't work out the math problem(问题),could you give me an e______?

9. The store has shoes at a very good p______.

10. E______ of the students in our class has an English dictionary.

名词解释

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