下列是生活中常遇到的混合物，属于溶液的是（） A．牛奶

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问题选择题

下列是生活中常遇到的混合物，属于溶液的是（　　）

A．牛奶

B．泥水

C．碘酒

D．碳素墨水

答案

A、牛奶不均一、不稳定属于乳浊液，不属于溶液，故A错；

B、泥水不均一、不稳定属于悬浊液，不属于溶液，故B错；

C、碘酒属于均一、稳定的混合物，属于溶液，故C正确；

D、碳素墨水属于胶体，不属于溶液分散质微粒太大，故D错．

故选C．

填空题

单词拼写，根据首字母或汉语提示用单词的适当形式填空。

1. Obama's first speech as president made a strong i________ on his audience.

2. Jackson, whose life motto is Never say die,is always o________, even when things are at his worst.

3. Tom kept studying hard and finally a________ a good knowledge of English.

4. He has been c_______ on English study and never failed an English exam.

5. Mary's mother will not a_______ of her marriage to Peter, which makes Peter very upset.

6. I recognized my former colleague the i________ I saw her in the gym the other day.

7. To his d________, his new novel was accepted for publication.

8. Who was the p________ (先前的) owner of the car?

9. ________ (除了) from their house in the downtown, they also have a villa in the countryside.

10. The passenger ________ (怀疑) the stewardess to be the pickpocket, but it was proved that she was

innocent.

问答题简答题

中速辊式磨煤机一次风和密封风间压差减小的原因？