已知一个自激振荡器的电容C＝2200pF，电感L＝0.5mH，求该电路的振荡频率f0

用括号中词的适当形式完成短文。

(playing, because, old, help, movies, favorite, school, best, be, difficult)

     Hi, everybody. My name is Paul. I am American. And I am eleven years     1   . Now I study in Shanghai.

I like my life here. At     2   , the students and teachers are kind (友好的) to me. They often    3    me learn

Chinese, but I still find it very    4    . Of all my subjects, my    5    is English    6    I can speak English very

well. I am the    7    student in English. After school, I like    8    sports. I usually play basketball with my

friends. Sometimes, I go to the    9    with my mother. I like Chinese action movies best, but my mother's

favorite movies    10    comedies.

1._____ 2._____ 3._____ 4._____ 5._____

6._____ 7._____ 8._____ 9._____ 10._____

-__________?

-It's nine o'clock.[ ]

A. What day is it

B. What's the time

C. What's the date

D. When is it

下列各项属于优抚医院社会工作中协助处理服务对象与医疗系统内容的是()。

A.手术或特别治疗之前及之后的心理辅导

B.增进与医护人员的沟通，建立适当关系

C.协助服务对象及其家庭运用有关的社会资源

D.对遭遇紧急或突发事件的服务对象进行危机介入

大脑中动脉阻塞的眼部表现为（）

A.同侧同向偏盲，有黄斑回避

B.对侧同向偏盲，有黄斑回避

C.对侧同向偏盲，无黄斑回避

D.同侧同向偏盲，无黄斑回避

E.以上都不对

发动机在选择机油时主要应考虑什么？