单项选择题
Ciscorecommendsadecibelreferencedto1milliwattsignallevelforthecoveragecelledgeatthepredetermineddataratethatisneededtosupporttheVoWLANdeviceandcallcapacityrequirements.WhatisthatsignallevelvalueforCiscoUnifiedWirelessIPPhones7920，7921G，and7925G？（）
A.-65dBm
B.-67dBm
C.-69dBm
D.-70dBm
- A.WhatisthatsignallevelvalueforCiscoUnifiedWirelessIPPhones7920，7921G，and7925G？（）
A.-65dBm
B.-67dBm
C.-69dBm
D.-70dBm
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