单项选择题
What will cause wireless voice devices to perform poorly？（）
A.average signal strength that is greater than -67 dBi B.cell overlap of 15 to 20 percent C.uneven wireless coverage D.absence of coverage holes
单项选择题 WhatdoesaCiscoUnifiedWirelessIPPhone7921Gdeploymentrequire（）？
单项选择题 WhichantennagenerallyhasthenarrowestfirstFresnelzoneinboththehorizontalandverticalplanes？（）
多项选择题 WhichtwomethodscanbeusedtopreventorreduceRFIfromcolocateddirectionalantennas（）
