我国南方和北方的地理分界线是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31824' and id < 2543747 and id<>'2543747' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31824' and id > 2543747 and id<>'2543747' order by id asc limit 5