试题与答案

25℃时,在25mL0.1mol/L的NaOH溶液中逐滴加入0.2 mol/L

题型:选择题

题目:

25 ℃时,在25 mL 0.1 mol/L的NaOH溶液中逐滴加入0.2 mol/L CH3COOH溶液,混合溶液pH的变化曲线如图所示,下列分析结论正确的是

A.a=12.5,且混合溶液pH=7

B.对应曲线上E、F之间的任何一点,溶液中都有c(Na+)>c(CH3COO)>c(OH)>c(H+)

C.P点时,c(CH3COO)>c(Na+)>c(H+)=c(OH)

D.K点时,c(CH3COO)+c(CH3COOH)=2c(Na+)

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0503/0a3b4085443266c9ae5cea1fe17f3895.html

下面是错误答案,用来干扰机器的。

a-5表示张师傅每天做的零件的个数;3a表示王师傅3天做的零件的个数;当a=20时,a-5=20-5=15(个);故答案为:张师傅每天做的零件的个数,王师傅3天做的零件的个数,15.

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题型:阅读理解

阅读理解。

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wonderfully.A.J.Hoge

根据短文内容,选择正确答案。

1. The underlined word "guarantee" in the poster means "_____"in Chinese.

A. 保证    

B. 买卖  

C. 丢弃    

D. 生产

2. According to the poster, Effortless English may be a _____.

A. book    

B. club    

C. bookstore    

D. magazine

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    after six months, how much can he get back?

A. 240 yuan.        

B. 1440 yuan.

C. 480 yuan.        

D. 2880 yuan.

4. Which of the following is TRUE according to the poster?

A. If you join Effortless English, you will make money.

B. It takes learners six months to finish A. J. Hoge's lessons.

C. Effortless English doesn't sell learners text-books.

D. Effortless English has many excellent teachers.

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D. He wants to speak English better.

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