WLAN技术使用的传输介质是（ ）。
- A.双绞线
- B.光线
- C.同轴电缆
- D.无线电波
正确答案及解析
正确答案
解析
无线局域网络（WirelessLocalAreaNetworks；WLAN）是相当便利的数据传输系统，它利用射频（RadioFrequency；RF）的技术，取代旧式碍手碍脚的双绞线与同轴电缆所构成的局域网络，使得无线局域网络能利用简单的存取架构让用户透过它，达到「信息随身化、便利走天下」的理想境界。射频就是是一种高频交流变化电磁波的简称。每秒变化小于1000次的交流电称为低频电流，大于10000次的称为高频电流，而射频就是这样一种高频电磁波。
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