划分阶级的根本标准是（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28722' and id < 2342887 and id<>'2342887' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28722' and id > 2342887 and id<>'2342887' order by id asc limit 5