现代师生关系的核心是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30339' and id < 2452624 and id<>'2452624' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30339' and id > 2452624 and id<>'2452624' order by id asc limit 5