关于声现象，下列说法中正确的是 A．声音在真空中传播的速度为3×108m/s B

题型：选择题

问题：

关于声现象，下列说法中正确的是

A．声音在真空中传播的速度为3×108m/s

B．学校附近禁止鸣笛是为了在传播路径上减弱噪声

C．课堂上能听到老师讲课的声音，说明空气能够传播声音

D．先后用不同的力敲击同一音叉，音叉发声的音调不同

考点：回声及回声测距离的应用
题型：选择题
阅读短文，从各题所给的四个选项中，选出一个正确答案。
     My mother often asked me, "What is the most important part of the body?" Through the years
I would guess at     1    I thought was the correct answer.
     When I was younger, I thought sound was very important to us as humans, so I said, "My    2    ,
Mommy. "     
     She said, "No. Many people are deaf. But you      3    thinking about it and I will ask you again soon. "
     Then last year,my grandpa     4    . Everybody was hurt. Everybody was crying. My mom looked at
me when it was our    5     to say our final goodbye to Grandpa. She asked me, "Do you know the most
important body part yet, my dear?"
     I was shocked     6     she asked me this now. I always thought this was a game between her and me.
She saw the confusion (迷惑) on my face and told me, "This    7     is very important. It shows that you
have    8     lived your life." I saw her eyes well up with tears (眼泪). She said, "My dear, the most important
body part is your shoulder."   
     I asked, "Is it because it holds up your head?"
     She replied, "No, it is because it can hold the head of a friend or loved one when they     9    . Everybody
needs a shoulder to cry on sometimes in life, my dear. I only hope that you have enough love and     10     
that you will have a shoulder to cry on when you need it."
( )1. A. if       
( )2. A. ears     
( )3. A. feel     
( )4. A. worried   
( )5. A. need     
( )6. A. when      
( )7. A. experience 
( )8. A. easily     
( )9. A. sleep     
( )10. A. visitors 		B. what  
B. eyes  
B. stop  
B. visited 
B. chance 
B. unless         
B. answer          
B. really
B. think 
B. friends		C. that      
C. body      
C. keep      
C. died      
C. duty     
C. before           
C. problem  
C. carefully  
C. laugh   
C. classmates		D. whether   
D. head         
D. forget      
D. came        
D. turn       
D. but                 
D. question    
D. especially 
D. cry        
D. teachers 
查看答案
题型：选择题

财政政策、货币政策是政府在宏观调控中常用的经济手段。一般来讲，为抑制经济过热，政府可以采取的措施有

[      ]

①减少税收  ②提高存贷款利率  ③减少政府开支  ④增加货币供应量

A．①②

B．①③

C．②③

D．①④
查看答案
题型：选择题

住房公积金管理的决策机构是( )。

A．住房公积金管理委员会

B．住房公积金管理中心

C．存储住房公积金的金融机构

D．设区城市人民政府
查看答案
题型：选择题

患者男性，45岁，已婚，个体户。反复出现容易烦躁、感头脑昏昏沉沉、脑子不清晰，精力欠佳、睡眠不好10年左右。躯体检查未见异常，未发现明显精神病性症状，未发现病理优势情感。

近1月来因生意不景气，东奔西走很是劳累，感症状明显加重，头昏乏力，头脑有些不清晰，诉有时算账不清，睡眠更差。此时最需要做的检查是

A．测体温

B．测血压

C．脑电图

D．头部CT

E．脑脊液
查看答案
题型：选择题

就给定资料所反映的主要问题，用1200字左右的篇幅，自拟标题进行论述。要求中心明确，内容充实，论述深刻，有说服力。
查看答案
更多题库

触屏版 | 网页版 | 题库网

Copyright © m.tikuol.com (粤ICP备2021010849号-1)