世界上第一家孵化器（Incubator）是一种新20世纪50年代创办于（）。

已知抛物线y=x²+bx+c与x轴只有一个交点，且交点为A（2，0）．

（1）求抛物线的解析式；

（2）若抛物线与y轴的交点为B，坐标原点为O，求△AOB内切圆的半径．

下列属于项目实施的管理策划的是( )。

A．项目实施各阶段项目管理的工作内容

B．项目实施期管理总体方案

C．生产运营期设施管理总体方案

D．生产运营期经营管理总体方案

阅读理解。

     Recently I paid a visit to Harvard university, where there are top class scientists and professors and the

best academic system in the world.

     I was pretty shocked when I first stepped onto the campus. Well, it's not even really a campus. it's more

like a district in a small town.

     Harvard's main buildings are from the 18th century. They look very old and simple. You might even say

they're a little shabby. They don't fit the modern idea of university at all. The buildings are surrounded by

grass and trees, so I felt as if I had walked into a medieval (中世纪的) castle. But when I looked across the

street, busy shops and in-fashion students made me feel like I was in the 21st century again. It creates a strong

contrast and brings a special atmosphere to the school.

     Our tour guide Gary took us around and told us:"You see this grass field in the center of the school? Here

is where they host their graduation ceremony. They just set up tents and benches and have a very simple

ceremony," Unbelievable! Who would think the most talented students just graduate on the lawn?

     I saw some students put a blanket on the grass and lie down to read a book. When I listened to the soft

sound of pages turning, along with chirping of the birds, I felt very much calm. There was no competitive

feeling at all.

     Harvard has the world's first computer in its science center and there are hundreds of high-end computers

too. Its religion and literature department are also among the best. It is the perfect mix of tradition and new

technology. It makes Harvard a very attractive place to study in.

1. What is the article mainly about?[ ]

A. The academic atmosphere in Harvard University.

B. The life of Harvard students.

C. The author's impression of Harvard.

D. The author's dream

2. When you walk in Harvard University, what do you find except that _____.[ ]

A. Some students read books on the grass

B. all building were built in the 18th century

C. Harvard is more like a district in a small town than a campus

D. there is a grass field where the graduation ceremony is held

3. Which field are among the best in the world?

A. Literature, religion and architecture

B. Religion, computer and architecture

C. Literature, religion and computer

D. Literature, computer and architecture

男，65岁。既往无慢性肺疾息。风湿性心脏病二尖瓣狭窄15年。体外循环瓣膜置换术后6小时，呼吸机辅助呼吸，吸入FiO75％，患者烦躁，PaO7．5kPa，心率100次／分，血压105／75mmHg。

此时应首先考虑患者是（）

A.休克代偿期

B.ARDS

C.循环衰竭

D.肺栓塞

E.MODS

802.11a工作在（）GHz无线频段。