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
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
第2题:
_________
A. private B. global C. different D. practical
第3题:
第4题:
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
第5题:
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