二尖瓣狭窄时，最有助于判断瓣膜弹性好坏的体征是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29029' and id < 2363013 and id<>'2363013' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29029' and id > 2363013 and id<>'2363013' order by id asc limit 5