单选题As an experienced technician, you are responsible for Technical Support. A customer calls to ask the best signal level and noise level for cell phone. How to respond?()A-40dBm signal and -90dBm noiseB-50dBm signal and -90dBm noiseC-30dBm signal and -90dBm noiseD-20dBm signal and -90dBm noise

单选题
As an experienced technician, you are responsible for Technical Support. A customer calls to ask the best signal level and noise level for cell phone. How to respond?()
A

-40dBm signal and -90dBm noise

B

-50dBm signal and -90dBm noise

C

-30dBm signal and -90dBm noise

D

-20dBm signal and -90dBm noise


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