下列哪一种方法是双胎的非整倍体筛査 (唐氏综合征筛查）最好的手段

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='26868' and id < 2233138 and id<>'2233138' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26868' and id > 2233138 and id<>'2233138' order by id asc limit 5