企业局域网通过路由器和服务器与互联网相连，要防止外来的网络攻击，必须（ )0

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='28850' and id < 2351341 and id<>'2351341' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28850' and id > 2351341 and id<>'2351341' order by id asc limit 5