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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