单项选择题
A.SNR
B.noise floor
C.level of interference
D.Received Signal Strength Indicator
单项选择题 WhatshouldbedoneifCiscoSpectrumExpertWi-Fireportsachannelutilizationof40percentonchannel36，fromasourceoutsideofthesite？（）
单项选择题 WhensurveyingforVoWLAN，whichpowerlevelshouldyoubasetheaccesspointcoveragedesignon？（）
单项选择题 Inanoutdoorbridgelink，whatiscalculatedbyusingthisformula：transmitterpower+antennagain-insertionORcableloss（）？