打鼾不仅影响别人休息,而且可能与患某种疾病有关,下表是一次调查所得的数据,试问:

题型:解答题

问题:

打鼾不仅影响别人休息,而且可能与患某种疾病有关,下表是一次调查所得的数据,试问:第一晚都打鼾与患心脏病有关吗?试用图形和独立性检验的方法进行判断。
 
患心脏病
未患心脏病
合计
每一晚都打鼾
30
224
254
不打鼾
24
1355
1379
合计
54
1579
1633
考点:频率分布表、频率分布直方图、频率分布折线图、茎叶图
题型:解答题

阅读理解。

     We know music is very important in our daily life. Do you notice music playing at any of those

places when you go somewhere? Today most stores, stations, restaurants and other places play music.

You might even hear music in an office or in a farm.

     Scientists believe that music influences the way people behave. They think that the sound of western

classical(古典) music makes people feel richer. When a restaurant plays classical music, people spend

more money on food and drinks. When the restaurant plays modern music, people spend less money.

Without music, people spend even less.

     Scientists also believe that loud, fast music makes people eat faster. Some restaurants play fast music

during their hours. This makes people eat faster and leave quickly. Restaurants can make more money

in this way.

     Some scientists think that music makes you think and learn better. They say that music helps students

to be more active. It is true that people learn better when they are relaxed. And listening to music can

help you relax.

     The next time you hear music somewhere, be careful, It might influence the way you do things.

1. According to the text, scientists believe that music can ________.

A. create different feeling for us    

B. help us to develop good habits

C. develop our interest in money    

D. influence natural environments

2. Western classical music is often considered to be ________.

A. a sign of being slower            

B. something about manners

C. a sign of being richer            

D. something with new styles

3. Which type of music below can make people work faster?

A. Light music.  

B. Rock music.    

C. Sweet music.  

D. Soft music.

4. The habit of listening to music can make a student ________.

A. slow in action  

B. care about manners 

C. fresh in mind  

D.  worry about studies

5. Which of the following can be the best title of the passage?

A. Music in Restaurants          

B. Good and Bad Music  

C. Types of Music                

D. Music and Behavior

题型:解答题

下列化合物中无芳香性的是()。

A.A

B.B

C.C

D.D

题型:解答题

放射防护的基本原则是()

A.实践的正当化

B.放射防护最优化

C.个人剂量限值

D.机房的防护

E.患者的防护

题型:解答题

开销字节C2=00H时,设备产生()告警。

题型:解答题

基肥

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