男婴，4个月。反复发作性吸气性呼吸困难伴吸气时喉鸣，口唇青紫3次，无发热，发作间歇一般情况良好，枕部指压有乒乓球样感，心、肺未见异常。首选的检査是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='28074' and id < 2301160 and id<>'2301160' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28074' and id > 2301160 and id<>'2301160' order by id asc limit 5