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

试题出自试卷《2011年程序员考试考前密卷（四）-上午试题》

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