问题
单项选择题
下列______不是广播信道的通信子网采用的基本拓扑结构。
A．环型
B．网状型
C．树型
D．总线型
答案
参考答案：B
解析： 考查网络拓扑分类方法。广播信道通信子网的基本拓扑构型有4种：总线型、树型、环型、无线通信与卫星通信型。B) 不是4种拓扑结构之一。目前广域网主要采用网状拓扑构型。
搜题请搜索小程序“爱下问搜题”
下列______不是广播信道的通信子网采用的基本拓扑结构。
A．环型
B．网状型
C．树型
D．总线型
参考答案：B
解析： 考查网络拓扑分类方法。广播信道通信子网的基本拓扑构型有4种：总线型、树型、环型、无线通信与卫星通信型。B) 不是4种拓扑结构之一。目前广域网主要采用网状拓扑构型。
请阅读下面的这篇文章，根据所提供的信息，完成信息卡，把答案写在答题卷指定的位置上。 As a student, you must have homework every day. How do you deal with your homework? When do you usually finish your homework? Here is some advice for you to help you finish your homework well. Homework should be done as soon as you get home from school. If you have after-school activities, the homework should be done first. At the same time, it is fine to allow for a snack break and also to allow for stretching(伸展) breaks. Also, you should remember that it is your duty to do your homework. Don’t depend on Mum and Dad for help. Please try to find the answer yourself because you will learn much more that way. When you have a question, especially something about a science or maths, don’t always turn to your teacher! It is a good idea to try to find the answer yourself. If this doesn’t work, you can also look at your textbooks carefully. They may help you understand the problem. Finally, while doing homework, don’t think about or do other things. Keep working. Setting a time limit(限制) often helps with this. Different ages decide different amounts of time. 10-15 minutes is good for a child that’s aged 6-8. A time of 20-30 minutes is about right for a child aged 9-12. Kids can keep studying for 30-45 minutes at the ages of 13-15. This, of course, depends on your ability to pay attention and stay on tasks. Information Card
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