An analog signal's characteristic quantity representing data may 66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is c

题目

An analog signal's characteristic quantity representing data may 66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is composed of(68)elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform,(69), and position in time. A digital signal is a special case of discrete signals, in which data are represented by a(70)number of well-defined discrete values that one of its characteristic quantities may take in time.

A．acquire

B．collect

C．assume

D．fetch

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  • 第1题：

    I don't need ()mineral water, but l' d like()tea,thanks.

    A.any , any

    B.any , some

    C.some , some


    参考答案：B

  • 第2题：

    I don't need ( )mineral water, but I'd like ( )_tea, thanks.

    A. some,any

    B. any,any

    C. any,some


    正确答案：C

  • 第3题：

    We couldn′t eat in a restaurant because__of us had__money on us.

    A.all;no
    B.any;no
    C.none;any
    D.no one;any

    答案：C
    解析：
    从前半句提供的信息来看，后半句应该是一个完全否定句，而A项中由all引导的句子是不完全否定的句子，即不全都……”，应予以排除。

  • 第4题：

    There are ______ books in your bag. But there aren’t ______ pens in it.

    A、some, some

    B、any ,some

    C、some, any

    D、any,any


    参考答案：B

  • 第5题：

    The medicine is on sale everywhere. 怎么选择

    The medicine is on sale everywhere. You can get it at ____________ chemist’s.

    A) each              B) some          C) certain                D) any

     


    D

    any chemist's 表示任意一个药店，随便哪个药店...

  • 第6题：

    （ ）Are you sure you don‘t have_______advice to give me I really need_______.

    A.any;any
    B.some;any
    C.any;some
    D.some;some

    答案：C
    解析：

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