1个月男婴，生后13天开始呕吐，进行性加重，喷射样，呕吐物不含胆汁，近3天尿少， 未排大便，查体有中度缺水征。应首先做的辅助检查方法是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='32574' and id < 2589415 and id<>'2589415' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32574' and id > 2589415 and id<>'2589415' order by id asc limit 5