问题 填空题

IP具有两种广播地址形式,一种叫直接广播地址,另一种叫 【13】

答案

参考答案:有限广播地址

解析: IP具有两种广播地址形式,一种叫直接广播地址,另一种叫有限广播地址。直接广播地址包含一个有效的网络号和一个全1的主机号,其作用是因特网上的主机向其他网络广播信息。32位全为1(255.255.255.255)的IP地址叫做有限广播地址,用于本网广播。它将广播限制在最小范围内。

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     What do you do to relax? Do you watch TV? Do you read a book? Or do you listen to music?

How many of us actually play a musical instrument? How many of us go to concerts? How important is

music in our lives? What kind of music do we like?

     The survey above shows the musical habits of a few of our readers. Interestingly, fourteen people

out of the twenty questioned actually play a musical instrument, while only six people don't. Out of these,

ten people practice their musical instrument between 0-3 hours a week and the other four between three

and six hours a week.

     The best instrument to play is the guitar; eight people say it is their favourite instrument to play.

Another four people like playing the piano and two like playing the violin. Two people, however, don't

like playing the violin or the piano as they think they are too difficult. 

     Pop concerts are always popular but, in this survey only eight people say they like going to concerts,

six to pop concerts and two to jazz concerts. 

     A higher number, eighteen, say they like listening to music as they find it relaxing. Only two people

don't like listening to music at all. These results seem to suggest that we are more actively musical than

we think ...

1. How many of the twenty people don't play a musical instrument?

2. How many of the fourteen people like playing the guitar?

3. Why don't the two people like playing the violin or the piano?

4. Do most people like listening to music?

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