问题 单项选择题

计算机中常用的一种检错码是CRC,即 (11) 码。在进行编码过程中要使用 (12) 运算。假设使用的生成多项式是C(x)=x4+x3+x+1。原始报文为11001010101,则编码后的报文为 (13) 。CRC码 (14) 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 (15)

12()

A.模二除法

B.定点二进制除法

C.二十进制除法

D.循环移位法

答案

参考答案:A

写作题

书面表达

根据中文提示和英文书信内容,写一封意思连贯、符合逻辑、不少于60词的回信。

信的开头和结尾已给出,其字数不计入所完成的回信内)

   假设你叫李明,是美国中学生Tom的笔友。请您根据他给你的电子邮件内容写一封回信。谈谈你喜欢读的书及你对读书这种爱好的看法。

   

Hi Tom,

It's very nice to hear that you like reading a lot.                                                                         

                                                                                                                                                       

                                                                                                                                                       

                                                                                                                                                        

                                                                                                                                                       

                                                                                                                                                       

                                                                                                                                                        

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Yours, 

Li Ming

单项选择题