The campers began to make________fire from the dry branches to cook their lunch,which made their tent catch________fire.[ ]

A. a; a  

B. /; a  

C. a; the  

D. a; /

采集支气管肺泡灌洗液检查，哪项叙述不正确

A．行纤维支气管镜检查时采集
B．先用单层纱布过滤，800r/min离心10min后分离标本
C．上清液用于生化和免疫检测
D．沉淀物只用于细胞学检查
E．沉淀物用于显微镜检查