循环冗余校验码（CRC)利用生成多项式进行编码。假设数据位为k位，校验位为r位，则CRC码的格式为（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30130' and id < 2438240 and id<>'2438240' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30130' and id > 2438240 and id<>'2438240' order by id asc limit 5