下列各种现象中，主要由内力作用形成的是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19452' and id < 1680927 and id<>'1680927' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19452' and id > 1680927 and id<>'1680927' order by id asc limit 5