用来进行通信的微波,在传播时,其性质更接近于( ) A.长波 B.中波 C.短波

题型:选择题

问题:

用来进行通信的微波,在传播时,其性质更接近于(  )

A.长波

B.中波

C.短波

D.光波

考点:光的传播速度与光年电磁波的传播
题型:选择题

阅读下面短文,掌握其大意,从A、B、C、D 四个选项中选出最佳选项.

  On 26th January, the biggest earthquake (地震) in India took the lives of 25, 000 people. In the morning, when everybody was enjoying holiday, earthquake began. It was about 7. 5 on the Ritcher scale. "There  is nothing left between the sky and the earth any more. Everything has been pulled down, " said  one

 of  the villagers alive. "There is no water, no food and no one has come to help. "

    Nobody died in Pakistan, a country next to India. The City of Lahore was lucky. In Lahore American

School, where I was studying, all of the students were safe. They were on the field, so most  children

didn't  feel anything. The earthquake was felt by the teachers that were on the  second floor.  However, 

though Mrs Young was also on the  second floor, she didn't  feel  anything. She didn't know   what  

happened  until  a teacher told her about it. Those teachers who were on the other floors had different 

feelings.  MrEmond, the maths teacher from Australia, said that when the  earthquake started he thought 

there  was  something  wrong with him, but then another teacher said that it was  an  earthquake. After  

those  words Mr  Emond felt better. Mrs Davis and Mr Frost didn't feel anything either.

    My mother didn't feel anything. She didn't even know that it was an earthquake till she saw a  shaking

(moving from side to side) light. My  dad  saw the  computer  shaking and  then he looked  out  of  the

window  and saw many people going out.

1. People use "Ritcher scale" to tell      .

A. where the earthquake takes place    

B. when the earthquake takes place

C. how serious the earthquake is        

D. how long the earthquake lasts

2. From the sentence " There is nothing left between the sky and the earth any more. " We learn

that           

A. India is a large country      

B. the Indian people had nothing after the earthquake

C. there is no tall building in India    

D. the earthquake in India was not serious

3. The City of Lahore is      .

A. in India          

B. in America

C. in Pakistan      

D. in Australia

4. Which of the following is true?   

A. I was with my parents when the earthquake happened.

B. The earthquake in the city of Lahore wasn't serious.

C. People in the City of Lahore were frightened when they knew it was an earthquake.

D. The teachers in Lahore American School were afraid of the earthquake.

题型:选择题

一农民师傅诊断为急性有机磷农药中毒,该患者的下列临床表现均可诊断为重度中毒,除了().

A.昏迷

B.瞳孔缩小

C.脑水肿

D.呼吸麻痹

E.肺水肿

题型:选择题

临床冠根比例以何解剖位置为分界线()

A.釉质牙骨质界

B.牙槽骨支持骨的水平线

C.龈缘平面

D.以牙在功能时的旋转中心为界

E.以上都不对

题型:选择题

表见代理属于广义( )的一种。

A.有权代理

B.无效代理

C.有效代理

D.无权代理

题型:选择题

telnet到IPPBX交换机的端口是多少()。

A、1250

B、21

C、23

D、80

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