试题与答案

完全竞争市场的两个主要特征是什么？

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题型：问答题 简答题

题目：

完全竞争市场的两个主要特征是什么？

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C

考点：经济学成本理论成本理论题库
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     I first went to hear a live rock concert when I was eight years old.My brother and his friends
were all   1   of a heavy metal group called Black Wednesday.When they   2   that Black
Wednesday were going to perform atour local theatre,they all bought   3   for the performance.
However,at the last minute,one of the friends couldn’t go,so my brother   4   me the ticket.I
was really   5  !
     I remember the buzz (嘈杂声) of excitement inside the theatre as we all found our   6  .After
a few minutes,the lights went down and everybody became   7  .I could barely make out the
stage in the   8  .We waited.Then there was a roar from the crowd,like an explosion,as the first
members of the band   9   the stage.My brother leaned over and shouted something in my ear,
but I couldn’t   10   what he was saying.The firstsong was already starting and the music was
as  11   as a jet engine.I could   12   the drum beats and the bass notes in my stomach.
      I can’t recall any of the songs that the band played.I just   13   that I really enjoyed the
show and didn’t want it to   14  .But in the end,after three encores (加演),the show finished.
We left the   15   and walked unsteadily out onto the pavement.I felt a little dizzy,as if I had just
  16  from a long sleep.My ears were still   17  with the beat of the last song.
     After the   18  ,I became a Black Wednesday fan too for a few years before getting into other
kinds of music.Once in a while,  19  ,I listen to one of their songs and   20  I’m back at that first
show.
( )1.A.members
( )2.A.guessed
( )3.A.flowers
( )4.A.booked 
( )5.A.relaxed  
(     06.A.seats
( )7.A.comfortable 
( )8.A.silence
( )9.A.fell upon  
( )10.A.forget   
( )11.A.loud  
( )12.A.feel  
( )13.A.realize 
( )14.A.continue 
( )15.A.party    
( )16.A.escaped   
( )17.A.aching  
( )18.A.competition  
( )19.A.though  
( )20.A.decide  		B.friends 
B.discovered
B.drinks
B.offered
B.embarrassed
B.entrance 
B.quiet
B.noise 
B.got through
B.hear
B.hard 
B.touch 
B.understand
B.delay
B.theatre
B.traveled
B.burning 
B.performance
B.otherwise 
B.regret 		C.fans  
C.thought  
C.clothes
C.returned  
C.excited  
C.spots
C.serious 
C.darkness   
C.broke into 
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C.sweet  
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C.believe 
C.finish
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C.interview   
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D.nervous 
D.smoke 
D.stepped onto
D.bear 
D.fast 
D.digest 
D.remember 
D.change 
D.stage
D.woken
D.rolling 
D.celebration 
D.besides 
D.imagine 
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（1）求把小球B从地面拉到半圆形轨道顶点C的过程中力F做的功？

（2）求小球B运动到C处时所受的向心力的大小？

（3）求小球B被拉到离地多高时，滑块A与小球B的速度大小相等？

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