如果父亲和孩子都是A型血，那么孩子 母亲的血型有几种可能？

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31340' and id < 2513207 and id<>'2513207' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31340' and id > 2513207 and id<>'2513207' order by id asc limit 5