For a wireless communication system, if the input power is 8 dBm, and the output power is 5 dBm, the system attenuation is ___ .
A、3 dBm;
B、3 dB;
C、13 dBm;
D、13 dB
发布时间：2025-08-03 04:27:05
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答案：3 dB
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