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WLAN的红外线传输波长是（）.
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关于WLAN上网业务描述错误的是？（）A、WLAN的业务品牌是随e行B、WLAN上网可提供高达11M速率C、WLAN热点区域一般由天线、AC和以太网交换机等组成。D、目前WLAN上网认证的主要方式是WEB认证
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