房地产经纪企业客户关系管理的核心是（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28992' and id < 2359812 and id<>'2359812' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28992' and id > 2359812 and id<>'2359812' order by id asc limit 5