支气管哮喘与心源性哮喘一时难以鉴别时，应采用下列哪种药物治疗A．异丙基肾上腺素 B．

如图水槽中装有纯净水，一束红色激光从空气中以入射角射到水面上的O点，设入射光的强度为100%用光传感器采集水底的折射光班的光强和光屏上采集到的反射光班的光强如下表：

入射光100%	=60°	=45°	=30°	=20°
反射光	约70%	约45%	约30%	A
折射光	约30%	约55%	约70%	约75%

①观察表中数据A应填______光从空气射入水中同时发生反射和折射，随着入射角的增大______．

②向水中加入粉尘搅拌均匀重复上述实验，反射光的数据变化不大，但折射光班处采集的数据大幅下降是因为______．

成人食管镜检查时，上切牙距食管入口的距离是（）。

A.16cm

B.16～17cm

C.17～18cm

D.18～19cm

E.20cm

如图12-16所示，横截面为矩形的管道中，充满了水银，管道的上下两壁为绝缘板，前后两壁为导体板（图中斜线部分），两导体板被一导线cd短路。管道的高度为a，宽度为b，长度为L。当加在管道两端截面上的压强差为P，水银沿管道方向自左向右流动时，作用在这段水银上的粘滞阻力f与速度成正比，即：f=kv.

(1)水银的稳定流速v₁为多大？

(2)将管道置于一匀强磁场中，磁场与绝缘壁垂直，磁感应强度为B，方向向上，此时水银的稳定流速v₂又是多大?(已知水银的电阻率为ρ，磁场只存在于管道所在的区域，不考虑管道两端之外水银对电路的影响。)

阅读理解。

     While all cultures share the same basic emotions, the body language used throughout different

cultures of  the world vary enormously. What can mean one thing in one country can often mean

something completely different in another.

     For example, in North America and Europe people tend to prefer direct eye contact. But in some

Asian countries longer eye contact is considered rude. So when communicating with people, always be

aware of different cultural customs that may exist.

     A V sign in the US could mean victory, but in England, it stands for a rude challenge, which has the

same meaning as showing the middle finger in the US.

     The OK gesture in America and England is given to mean everything is good or well. But in Latin

America is looked on as a rude sign.

     The thumbs up sign in America and most of Europe means that something is good or well done, but

it is considered rude in many Asian countries.

     Putting your feet on the table is generally not thought to be rude in America and England. However,

in Thailand it is really rude.

     Telling someone to come to you by curling your index finger is acceptable in America and England,

but this gesture signifies death in Singapore.

     Raising your hand up means stop in America and England. In some Asian countries this gesture is

used when asking for permission to speak.

     In most westernized countries it is considered normal for two men to shake hands. In some Asian

countries it is quite normal for men to kiss each other, while in most westernized countries men kissing

in public would be viewed as homosexual behavior.

     If you would like more information on different cultural gestures all over the world, see this site on

nonverbal communication.

1. What's the best title for this passage?

A. How gestures can vary in different cultures.

B. What gestures can be acceptable in western countries?

C. What can we do when traveling? 

D. How to be friendly to others

2. In Singapore when someone died, people there usually ________.

A. put thumbs up                

B. curl their middle fingers

C. curl their index fingers

D. raise their hands up

3. To what main clue is the passage written when the writer tries telling readers different cultural gestures?

A. Asian countries    

B. Latin America

C. America and England

D. Southern Asia

4. The passage may come from ___________.

A. a radio program  

B. a TV channel  

C. a magazine column    

D. the Internet  

在GB2635-92《烤烟》标准中，烤烟级别CX1K中的“K”代表（）。