单项选择题
By how much is a signal’s strength reduced when the signal passes through an object thatintroduces 3 dB of attenuation？（）
A.1/6 B.1/4 C.1/3 D.1/2
单项选择题 Whatistheminimumrecommendedaccesspointoverlapforvoiceroaming？（）
单项选择题 WhichclassofCiscoaccesspointsoperateunderIEEE802.3afpower？（）
单项选择题 Toprovideefficientroamingbetweenthecells，whichpercentofcelloverlapisrecommendedfor2.4GHzand5GHzaccesspoints？（）
