鼻导管低流量3L／min给氧，FiO2可达（）。
A.24％
B.28％
C.32％
D.36％
E.40％
参考答案：C
The discovery of new evidence led to _________.
A．the thief having caught
B．catch the thief
C．the thief being caught
D．the thief to be caught
硫酸的分子量为（）。
A.98
B.99
C.100
D.92
