划分课的类型的主要标准是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32135' and id < 2563227 and id<>'2563227' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32135' and id > 2563227 and id<>'2563227' order by id asc limit 5