When did Barbie Doll first appeared in public?
A. 1949
B. 1950
C. 1958
D. 1959
查看答案
The USA has no national emblem.
A. 对
B. 错
王某,车祸致左下胸部外伤,急诊B超提示“脾破裂”,脉搏细速90次/分,血压86/40mmHg。休克指数常可用于判断创伤患者的失血情况,通过计算该患者休克指数预计失血量达循环血量的
A. 10%~20%
B. 20%~30%
C. 30%~40%
D. 40%~50%
E. 50%~60%