n结果除以生成的多项式(使用无进位求2的摸数方法)，余数就是CRC.忽视商，把余数(CRC)加进数据位，把该信息和CRC一起发送。接收装置用该信息加上CRC去除以生成的多项式，如果余数是0,发送就是无错误发送。一个生成多项式用X幂的代数和表示
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