教师劳动对象的差异性导致了教师劳动具有（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30338' and id < 2452603 and id<>'2452603' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30338' and id > 2452603 and id<>'2452603' order by id asc limit 5