磁盘清理的作用主要是（23)。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29744' and id < 2415269 and id<>'2415269' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29744' and id > 2415269 and id<>'2415269' order by id asc limit 5