三角洲一般形成于（      ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19473' and id < 1686338 and id<>'1686338' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19473' and id > 1686338 and id<>'1686338' order by id asc limit 5