扎止血带的部位应在静脉穿刺点上方约()。A．2cm B．4cm C．6cm D．8c

预防破伤风的疫苗是

A．类毒素
B．减毒活疫苗
C．灭活菌苗
D．减毒活菌苗
E．抗毒素

Welcome to the Grand Center--the place for all the family

If you like sports, go to the sports center on the twenty-eighth floor. On the twenty-eighth floor, we have a ping-pong room. If you like films, go to the twenty--seventh floor and watch a film in the ABC Cinema.
If you like to eat, there are a lot of places in the Grand Center for you to go to. You can try Wonderful Restaurant. That’s a new restaurant on the twenty-first floor. Crazy Town ( a Sichuan restaurant)is on the twenty-third floor and there’s an American restaurant on the twenty-sixth. But don’t worry, children ! If you like other kinds of foreign food, you can go to the coffee shop on the first floor. It’s really great.
If you like to shop, there are the twelfth to the nineteenth floors. On the twelfth floor, for example, there’s AST World for computers and computer games. There’s a big store on the fifteenth floor for radios, TVs and CDs. And the nineteenth floor has sports stores and a supermarket.

Where can you have some food
[A] On the twenty-second floor．
[B] on the twenty-third floor．
[C] On the twenty-fourth floor．

And there’s Rose Hall for all you dance people ( for people over 14 years old). That’s on the top floor, of course. You can dance and sing all night.

最近科学家成功制成了一种新型的碳氧化合物，该化合物晶体中每个碳原子均以四个共价单键与氧原子结合为一种空间网状的无限伸展结构。下列对该晶体叙述错误的是 [ ]

A．该晶体类型是原子晶体

B．该晶体中碳原子和氧原子的个数比为1:2

C．晶体中碳原子数与C-O化学键数之比为1:2

D．晶体的空间最小环由12个原子构成

检波器面积组合及其作用是什么？

The objective of the ASTP (Army Specialized Training Programme) was to attain ______ proficiency in a variety of foreign languages.