问题
单项选择题
下列各指标中，属于数据通信系统的主要技术指标之一的是
A．误码率
B．重码半
C．分辨率
D．频率
答案
参考答案：A
解析： 数据通信系统的技术指标生要从数据传输的质量和数量来体现。质量指信息传输的可靠性，一般用误码率来衡量。而数量指标包括两方面：一是信道的传输能力，用信道容量来衡量；二是指信道上传输信息的速度，相应的指标是数据传输速率。
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下列各指标中，属于数据通信系统的主要技术指标之一的是
A．误码率
B．重码半
C．分辨率
D．频率
参考答案：A
解析： 数据通信系统的技术指标生要从数据传输的质量和数量来体现。质量指信息传输的可靠性，一般用误码率来衡量。而数量指标包括两方面：一是信道的传输能力，用信道容量来衡量；二是指信道上传输信息的速度，相应的指标是数据传输速率。
One will feel happy when others flatter( 奉承) him in his face. It is said that the best way of flattering someone is to give him a “top hat” 31 . A student was going to leave the capital to become 32 official (官员) in a city far away. Before he started, he came to say 33 to his teacher. “It is 34 job to be a good official.” his teacher said. “ you must be strict 35 yourself and never be careless.” “Don’t worry about me, sir.” The student answered. “I have already 36 anyone hundred top hats, which will 37 those people quite happy.” “But we are really gentlemen! 38 could a real gentleman do such a thing ? ” His teacher was a bit _39 . “ Never forget 40 I taught you in class!” “ 41 are always right, sir. I also hate such things. But, sir, 42 no one really gentleman like you can be seen in the world now.” said the student. It seemed that he had to do so. 43 hearing this, the teacher was pleased. “What you said is true!” “I have 44 one top hat already. Now I have ninety-nine 45 .” the student said to his friend later on when he asked the student what he had talked with the teacher about. 小题1:A. to dress B. dressing C. wearing D to wear
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