价值评价在实践中所起的作用主要有（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28431' and id < 2322209 and id<>'2322209' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28431' and id > 2322209 and id<>'2322209' order by id asc limit 5