男性，34岁。间歇发生呕血1周，每次量 300〜1 000ml,伴有柏油样便2次/d，否认肝 炎病史。査体:贫血貌，心率100次/min，血 压正常。最可能的病因是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='31867' and id < 2547867 and id<>'2547867' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31867' and id > 2547867 and id<>'2547867' order by id asc limit 5