患儿男，10岁。面容无特殊，只能做10以内加减法，染色体核型为46,XY/47,XY,+21,最可能诊断为

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28774' and id < 2346112 and id<>'2346112' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28774' and id > 2346112 and id<>'2346112' order by id asc limit 5