Although a given waveform. may contain frequencies over a very broad range,as a practical matter any transmission system will be able to accommodate only a limited band of (71) .This,in turn,limits the data rate that can be carried on the transmission (72

题目

Although a given waveform. may contain frequencies over a very broad range,as a practical matter any transmission system will be able to accommodate only a limited band of (71) .This,in turn,limits the data rate that can be carried on the transmission (72) .Asquare wave has an infinite number of frequency components and hence an infinite (73) .However, the peak amplitude of the kth frequency component,kf,is only 1/k,so most of the (74) in this wavefonn is in the first few fiequency components.In general,any digitalwaveform. will have (75) bandwidth.If we attempt to transmit this waveform. as a signalover any medium,the transmission system will limit the bandwidth that can be transmitte

(71)

A.frequencies

B.connections

C.diagrams

D.resources


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  • 第1题:

    类 Contain 的定义如下: class Contain { private: int x; protected: int z; public: class Embed { private: int y; public: Embed ( ) { y=100; } int Embed_Fun(); }MyEmbed; int Contain_Fun(); }; 下列对上面定义的描述中,正确的是( )。

    A.定义类Embed对象的语句是:Contain::Embed Myobject;

    B.类Contain的成员函数Contain_Fun()中可以访问对象MyEmbed的私有成员y

    C.类Embed的成员函数Embed_Fun()中可以直接访问类Contain的所有成员

    D.类Embed的成员函数Embed_Fun()中只能直接访问类Contain的公有成员


    正确答案:A
    解析:对象MyEmbed是类Contain的成员对象,通过对象MyEmbed不能访问其私有数据成员y,所以选项B是错误的。类Embed是类Contain的嵌套类,类Embed的成员函数不能直接访问类Contain的所有成员,所以选项C和D都是错误的。

  • 第2题:

    _________

    A. private B. global C. different D. practical


    正确答案:C

  • 第3题:

    根据以下内容,回答235-239题。


    What is the last day to apply for the WHC position? (  )

    A.May 1
    B.May 10
    C.May 17
    D.May 27

    答案:B
    解析:

  • 第4题:

    Whatarethefoursteps,intheircorrectorder,tomitigateawormattack?()

    A.contain,inoculate,quarantine,andtreat

    B.inoculate,contain,quarantine,andtreat

    C.quarantine,contain,inoculate,andtreat

    D.preparation,identification,traceback,andpostmortem

    E.preparation,classification,reaction,andtreat

    F.identification,inoculation,postmortem,andreaction


    参考答案:A

  • 第5题:

    The story was published with the sole purpose of selling newspapers.

    A: real
    B: main
    C: only
    D: practical

    答案:C
    解析:
    题干意为“这个故事刊登的唯一目的就是售卖报纸。” 句中划线词意为“唯一的”。C项only意为“唯一的,仅有的”;例句:He had only a few coppers with him.他身边只有几枚铜币。A项意为“真实的”;B项意为“主要的,最重要的”;D 项意为“实践的,实际的”;故选C。

  • 第6题:

    下面英文日期写法错误的是____?

    A.May 1, 2015

    B.1 May,2015

    C.1 May 2015

    D.May 1st, 2015


    10 Oct.,2015