下列说法中哪个是不正确()A、凡是能进行氧化还原反应的物质,都能用直接发测定其含量

题型:单项选择题

问题:

下列说法中哪个是不正确()

A、凡是能进行氧化还原反应的物质,都能用直接发测定其含量

B、酸碱滴定法是以质子传递反应为基础的一种滴定分析法

C、适用于制剂滴定法的化学反应,必须是能定量完成的化学反应

D、反应速度快是滴定分析法必须具备的重要条件之一

考点:水环境监测工水环境监测工题库
题型:单项选择题

人们用______为单位来表示声音的强弱,______分贝是一般人刚能听到的频率为1000赫兹的声音强度.---------听觉下限.为了保护听力,声音不能超过______分贝,为了保证工作和学习,声音不能超过______分贝,为了保证休息和睡眠,声音不能超过______分贝.

题型:单项选择题

按要求改写下列各句,每空一词。

1. Both my father and I went to the cinema yesterday evening. (改为否定)

    _______ my father _______ I went to the cinema yesterday evening.

2. You must hand in your homework now. (改为被动语态)

    Your homework _______ _______ _______ in now.

3. The key is used for locking our classroom door. (就划线部分提问) 

    _______ _______ the key _______ for?

4. I bought the car last year. (改为被动语态)

    The car _______ _______ last year.

5. She has had the bike for 5 years. (就划线部分提问) 

    _______ _______ has she had the car?

6. Must I water the flower every day? (给出否定回答)

    _______, you _______.

7. "Don't be late for school." Tom's father said to him. (改为一个简单句)

    Tom's father _______ Tom _______ _______ _______ late for school.

8. "Would you like to go to the party?" Meimei asked me. (改为一个主从复合句)

    Meimei asked me _______ I _______ _______ to go to the party.

9. She's got some books about art, _______ she? (改成反意疑问句) 

10. There are some apples in the basket. (改变否定句)

    There _______ _______ apples in the basket.

题型:单项选择题

在Word文档中选中一段文字后,按()键可将其放入剪贴板中。

A.Ctrl+A

B.Ctrl+V

C.Ctrl+C

D.Ctrl+F

题型:单项选择题

煤粉的均匀性可以用均匀性指数来表示,值().

题型:单项选择题

因压缩机为非经常运转设备,特别是较长时间停用后的启动之前()进行检查。

A.必须

B.可以

C.随便

D.应该

更多题库