海水淹溺者应给予下列哪项乙醇湿化后吸氧（）
A.20%～30%
B.30%～40%
C.40%～50%
D.40%～60%
E.30%～50%
参考答案：C
To children, good habits do not come , so parents and teachers need to be their role models.
A．instantly
B．automatically
C．eventually
D．steadily
高剂量率、中剂量率和低剂量率有何不同?
