【单选题】【消耗次数：1】
计算机网络有局域网和广域网之分,其划分依据是( )。
①
通信传输的介质
②
网络拓朴结构
③
信号频带的占用方式
④
通信的距离
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【多选题】
计算机网络拓朴结构有论述正确的有：（ ）。
①
网络拓朴不涉及信号的流动，只关心介质的物理连接形态
②
网状结构是局域网中主要的拓朴结构之一
③
星型拓朴中故障的定位容易
④
环型结构中对网络的扩展比较困难
随机题目
【单选题】
阳光中的紫外线照射到皮肤上可生成( )。
①
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②
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③
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④
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