鼻导管给氧,氧流量3L/分,氧浓度为()。
A.25%
B.29%
C.33%
D.37%
E.41%
参考答案:C
解析:[知识点] 氧气成分、浓度、氧浓度和氧流量的换算法
数据仓库系统(DWS)由数据源、数据仓库管理工具和______三部分组成。
Martian Brother is the nickname for a boy called Hua Chenyu won the 2013 Supei Boy.
A.who
B.which
C.whose
D.what