什么叫统一式燃烧室？

（1）如图所示，一束光从空气斜射到某液面上发生反射和折射，入射光线与液面成30°角，则反射光线与入射光线的夹角大小为______；若反射光线与折射光线的夹角为83°，则折射角的大小为______．

（2）如图所示，在研究凸透镜成像规律的实验中，光屏上呈现了烛焰倒立清晰的像．如果去掉光屏，眼睛在A处______（选填“能”或“不能”）看到这个像，原因是______．

Bored by the Chinese courses he was majoring in, Zuo Cheng, 18, couldn't imagine having to drag himself into class day after day, week after week, for four years．

The Beijing Language and Culture University student decided that enough was enough．

小题1:  

"It may seem like I've wasted a year and have to start college all over again, but now that I've settled on a field I'll be able to concentrate．" Zuo said．

Zuo is not alone．

At the China Three．Gorges University in Yicljang in Hubei Province 53 out of 59 students in the Physics Department took transfer exams last semester． 小题2:  

"  小题3:   Many students picked colleges before majors, only to discover their mistakes a few weeks after arrival on the campus．" said Jiang Xin, 20, who was able to switch to electrical engineering and automation from physics．He said that physics graduates had few other options besides going into teaching,    小题4:  

A new survey, of 2,500 students nationwide starting in September this year, suggests that as much as 35 percent of students are disappointed by their courses．

However, Shao Yangfang, who works at the admission office of University of International Business and Economics in Beijing, advised students to consider both short-term and long-term goals．

"After graduation do you want to find yourself in a job very specially related to your college major? Or, would you like to possess the knowledge and skills that will enable you to work in many areas?小题5:    Above all, your choice of major should be based on your own interest, abilities and personality．" Shao said．

A．These are the questions students need to consider．

B．After rounds of exams and interviews, he managed to transfer to the Department of International Accounting．

C．He added that a career in education just didn't suit him．

D．Unfortunately only 22 of them got a place on another major．E．Many college students don't care about their future career．

F．When we were at high schools very few of us understood how a major relates to a career．

G．When we were at high schools, we already knew what are hot majors and what are unexpected ones．

下列哪种不是活检获取病变组织的方法（）。

A.纤维支气管镜刷片

B.局部切除

C.钳取

D.细针吸取

E.搔刮

扑救燃气火灾，使用什么灭火剂最合适？（）

A.二氧化碳

B.水

C.干粉

D.泡沫

关于欧洲的贵族，说法错误的是（）。

A、比较独立，不完全依附于朝廷

B、基本上是朝廷的官僚

C、贵族的权力很大

D、较为制度化