教师上课必要的补充主要是通过（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32136' and id < 2563244 and id<>'2563244' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32136' and id > 2563244 and id<>'2563244' order by id asc limit 5