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
—Where have you been?
—I was stuck in the heavy traffic. Otherwise I ____here earlier.
A．was coming
B．was
C．would have come
D．would come
园林中节假日的日变化系数一般取（）。
A、1.2-2.0
B、2-3
C、4-6
D、3-10
