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弱电解质的电离程度可用电离度（）表示：，现有pH均为4的HCl和溶液，则两种溶液中H2O的电离度之比为（　　）

A．1:2

B．2:5

C．1:106

D．106:1

答案

答案：C

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Hi! I’m Cheng Ling. I’m a s小题1: of Class 3,Grade 7.My school life is very i小题2: .

We have four classes in the m小题3: . Classes begin at 8 o’clock. In the afternoon, we have two classes. We have English, science, history, music and s小题4: other subjects. M小题5: is my favorite subjects. I often sing and dance with my classmates on weekends. But I don’t l小题6: science, because I think it’s difficult and b小题7: . Do you think so?

After school, I often play soccer with m小题8: friends. Sometimes I swim in the swimming club. But my favorite sport is volleyball. And I can play it w小题9: .

I like my school life very much. Can you t小题10: me about your school life?
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独立避雷针不应设在人经常通行的地方，避雷针及其接地装置与道路或出入口等的距离不宜小于（）米。
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