试题与答案

流式细胞仪荧光信号的放大采用线性放大器,当输入信号比过去增加20倍时,其输出信号是(

题型:单项选择题

题目:

流式细胞仪荧光信号的放大采用线性放大器,当输入信号比过去增加20倍时,其输出信号是()

A.原来的十分之一

B.不变

C.比过去增加20倍

D.由1变为2

E.由2变为3

答案:

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参考答案:B解析:1941年张如心在《论布尔什维克的教育家》中最早使用了“毛 * * 同志的思想”的提法;1943年王稼祥在《中 * * 党与中国民族解放的道路》中明确提出并多次使用了“毛 * * 思想”这个概念,这是中国...

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阅读理解。

     For most people, the word "fashion" means "clothes". But people may ask the question, "What clothes

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     But of course there are fashions in many things, not only in clothes. There are fashions in holidays, in

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      Fashions change as time goes. If you look at pictures of people or things from the past, you will see

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      Today fashions change very quickly. Some of this is natural. We hear about things much more quickly

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       New fashions mean that people will buy new things, so you see there is money in fashion.

1. What's the meaning of the word "fashion" in this passage? _____

    A. clothes                          

    B. many things

    C. most of the popular things          

    D. everything

2. Which of the following things is fashionable today?

    A. Surfing on the Internet.

    B. Having a family dinner on New Year's Day.

    C. Learning to sing songs on the radio.

    D. Doing morning exercises at school.

3. Why do fashions change very quickly? Because _____.

    A. people read newspapers every day

    B. radios send information from one country to another

    C. new things that people like are often shown on TV

    D. people quickly learn what is happening in the world

4. What's the meaning of the underlined sentence "There is money in fashion. "

    A. Clothes are expensive.

    B. Money comes from fashion.

    C. People like new things.

    D. There are no fashions without money.

5. The best title of this passage is _____ .

    A. Fashions.                      

    B. Fashion means clothes

    C. Fashion means money                

    D. A fashionable color

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