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
正确答案:A
答案解析:有
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