班级属于正式群体，正式群体的发展一般会经历的阶段有（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30427' and id < 2459038 and id<>'2459038' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30427' and id > 2459038 and id<>'2459038' order by id asc limit 5