女，31岁，孕足月，第一胎，产后3天，发热38.4℃伴寒战。提示：分娩时为胎膜早破，总产程24小时，会阴切开，低位产钳助产。查体：体温38.4℃，宫底平脐，左宫旁压痛明显，恶露血性，混浊有味。

最有助于诊断的项目是（）

A.血常规

B.血培养

C. * * 分泌物培养

D.中段尿培养

E.尿常规

F.盆腔B超

If passengers are on board when an abandon ship drill is carried out，they should（）.

A.take part

B.watch

C.go to their quarters

D.stay out of the way and do what they want