璃目治遒必须履行的四大职能是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27198' and id < 2255183 and id<>'2255183' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27198' and id > 2255183 and id<>'2255183' order by id asc limit 5