(2019 .北京）地球可视为一个大磁休，地磁场是指地球内部存在的天然磁性现 象。下列现象或应]与地磁场无关的是：

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29349' and id < 2389857 and id<>'2389857' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29349' and id > 2389857 and id<>'2389857' order by id asc limit 5