问题
单项选择题 A1/A2型题
小儿扁桃体炎的好发年龄为()
A.新生儿
B.1岁
C.1~3岁
D.4~10岁
E.14~15岁
答案
参考答案:D
解析:咽扁桃体6个月已发育,腭扁桃体在1岁末才逐渐增大,在4~10岁时发育达高峰,14~15岁后逐渐退化,因此扁桃体炎常见于4~10岁的小儿。
小儿扁桃体炎的好发年龄为()
A.新生儿
B.1岁
C.1~3岁
D.4~10岁
E.14~15岁
参考答案:D
解析:咽扁桃体6个月已发育,腭扁桃体在1岁末才逐渐增大,在4~10岁时发育达高峰,14~15岁后逐渐退化,因此扁桃体炎常见于4~10岁的小儿。
An analyst does research about the covariance of returns and gathers the following information about the retums of two securities:
Probability | Security 1 | Security 2 |
0.6 | 0% | 20% |
0.4 | 20% | 0% |
A. -36
B. -64
C. -96