以下不属于遗传筛査手段的是（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26839' and id < 2231812 and id<>'2231812' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26839' and id > 2231812 and id<>'2231812' order by id asc limit 5