试题详情
- 单项选择题As an experienced technician， you are responsible for Technical Support. A customer calls to askthe 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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