按照学科固有的属性来划分，课程分为学科课程和（ ）两种基本课程。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31413' and id < 2518352 and id<>'2518352' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31413' and id > 2518352 and id<>'2518352' order by id asc limit 5