问题 问答题 简答题

简述hfPLS点各通道输出光功率及偏差。

答案

参考答案:

测试步骤如下:

(1)接好电路:

(2)测试并记录每条通道的输出光功率:

(3)计算并找出各通道输出光功率差异的最大值。

完形填空
完形填空

     While I was waiting to go into university, I saw in a newspaper a teaching job wanted at a school
about ten miles from where I   _1_  . Because I was in great need of   _2_   and wanted to do something
useful, I applied(申请).
     Three days later, a letter   _3_  . It asked me to see the   _4_   at Croydon. It proved to
be a(n)   _5_   journey -a train to Croydon station, a ten-minute bus ride and then a walk of   _6_   a
quarter of a mile. As a result I arrived there, feeling too hot to be nervous. Clearly, the principal   _7_  
opened the door. He was   _8_   and round."
     The school" he said, "has a group of twenty-four boys between seven and thirteen." I should have to
teach all the   _9_   except art, which he taught himself.
     I should have to divide the class into  _10_   groups and teach them at three different  _11_  , and I
was not   12_   at the thought of teaching maths -a subject which I didn't do very well in at school. It
was   13_   that I had to teach them on Saturday afternoon    14_  most of my friends would be    15_ 
themselves at
that time.
     Before I had time to ask about my salary(薪水), he got up to his feet. "Now," he said. "you'd better
meet my wife. She is the one who really runs this school.

( )1.  A. lived  
( )2.  A. help  
( )3.  A. arrived  
( )4.  A. editor
( )5.  A. comfortable
( )6.  A. at least
( )7.  A. herself
( )8.  A. bad    
( )9.  A. people  
( )10. A. two    
( )11. A. subjects
( )12. A. glad  
( )13. A. better
( )14. A. until  
( )15. A. enjoying

B. played
B. money  
B. received
B. teacher  
B. difficult
B. at first
B. themselves
B. glad  
B. subjects
B. three  
B. lessons  
B. surprised
B. more exciting
B. after  
B. helping  

C. studied
C. rest
C. returned
C. principal
C. short
C. at last
C. itself
C. short
C. boys
C. four
C. levels
C. angry
C. worse
C. if
C. studying

D. worked      
D. force      
D. wrote      
D. student    
D. unpleasant  
D. at most    
D. himself    
D. smiling    
D. knowledge  
D. five        
D. schools    
D. sad        
D. nicer      
D. because    
D. arguing    

单项选择题