种群数目较少时，有较大的机会发生（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29829' and id < 2420934 and id<>'2420934' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29829' and id > 2420934 and id<>'2420934' order by id asc limit 5