单选

●计算机中常用一种检错码是CRC,即 (9) 码。在进行编码过程中要使用 (10) 运算。假设使用的生成多项式是G(x)=x5+x4+x+1。原始报文为11001010101,则编码后的报文为 (11) 。CRC码 (12) 的说法是正确的。在无线电通信中采用7中取3定比码,它规定码字长为7位,并且其中总有且仅有3个"1"。则编码效率为 (13) 。

 (9)

  • A.水平垂直奇偶校检    &n
  • bsp;  B.循环求和    
  • C.循环冗余    
  • D.正比率    (10) A.模2除法
  • B.定点二进制除法
  • C.二一十进制除法
  • D.循环移位法    (11) A.1100101011001
  • B.11001010100100l
  • C.11001010101011010
  • D.110010101010011    (12) A.可纠正一位差错
  • B.可检测所有偶数位错
  • C.可检测所有小于校验位长度的突发错
  • D.可检测所有等于、小于校验位长度的突发错    (13) A.(log235)/7
  • B.5/7
  • C.log23/log27
  • D.2/7
参考答案
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  • C compiler show the message text,the most common cause of the error,an
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  • D.Very long instruction word

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  • byte streams in the transport layer.Appli
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  • d
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  • at is the decimal value of the
  • binary value 10010? (70) .    (70) A.18
  • B.20    
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  • D.15

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  • ase of the software engineering process is the Software Requirements Specification developed?&n
  • bsp; (68) .    (68) A.development phase
  • B.engineering phase    
  • C.maintenance phase    
  • D.Definition phase

● The sorting method described by the code is c

  • alled&n
  • bsp;(67) .    (67) A.Insertion sort
  • B.Sele
  • ction sort
  • C.Ra
  • dix sort
  • D.Merge sort
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