单项选择题 Ciscorecommendsadecibelreferencedto1milliwattsignallevelforthecoveragecelledgeatthepredetermineddataratethatisneededtosupporttheVoWLANdeviceandcallcapacityrequirements.WhatisthatsignallevelvalueforCiscoUnifiedWirelessIPPhones7920，7921G，and7925G？（）A.-65dBmB.-67dBmC.-69dBmD.-70dBm

单项选择题 Accordingtothefollowingstatement，canyoutell&ensp

单项选择题 ForwhichWMMqueueisU－APSDmostbeneficial?（）