一定质量的氯酸钾和二氧化锰的混合物中，二氧化锰的质量分数为20%，加热后，剩余的固体混合物中二氧化锰的质量分数升高至25%，则氯酸钾的分解百分率为

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一定质量的氯酸钾和二氧化锰的混合物中，二氧化锰的质量分数为20%，加热后，剩余的固体混合物中二氧化锰的质量分数升高至25%，则氯酸钾的分解百分率为（）

A：64%

B：75%

C：80%

D：85%

上一题下一题 0.0难度选择题更新时间:2017-08-14 05:50:09

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A

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还原短文。

My mother is a kind and nice woman. ____ One Sunday night, when I was watching the film Harry Potter very happily. Mother asked me to go to bed. ____ that I didn't move. But for a while, I noticed that she didn't say anything. ____ I was so sad that I went into my room and cried. I thought "I have only two nights in a week to enjoy the TV. ____" The next day she cooked and talked with me as usual. I pretended not to hear, but she didn't mind and told me why she didn't allow me to watch TV ____ Then I understood her. I love my mother.

A. But she is very strict with me.

B. Because she wanted me to have a good rest.

C. Then she got angry and turned off the TV.

D. I love the film so much.

E. Why doesn't mother allow me to watch TV?

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