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问题 单项选择题

A chart position enclosed by a square is a(n)（）.

A.fix

B.estimated position

C.dead reckoning position

D.running fix

答案

参考答案：B

改错题
短文改错。此题要求改正所给短文中的错误。如无错误，在该行右边横线上画一个对号；
如多词，则用（ \ ）划掉；
如缺词，则在此处加一个（^），并把正确的写在 横线上；
如错一词，则在此词下面划线，在右边横线上写出改正后的词。
      When it was so warm, I stayed awake in purpose               
until half past eleven in one evening in order to have         
a good look at the moon by myself. And as the                
moon gives far too much light, I didn't dare open             
a window. Another time five months ago, he happened           
to upstairs one evening when the window was open.             
I didn't go to downstairs until the window had to be shut.   
The dark, rain evening, the wind, the thundering clouds       
held us entirely in their power; it was the first time in a    
year and a half that I have seen the night face to face.    		1._______            
2._______                
3._______           
4._______             
5._______              
6._______                                                   
7._______            
8._______                  
9._______            
10._______     
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单项选择题

GPRS具有的特点为（）。

A.按时收费

B.永远在线

C.服务内容多

D.提供语音服务
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