子网掩码是用来判断任意两台计算机的IP地址是否属于同一子网的依据。（  ）  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69451' and id < 4497734 and id<>'4497734' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69451' and id > 4497734 and id<>'4497734' order by id asc limit 5