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小于-50dB(-40，-30和-20)=信号强度的100% 从-51到-55dB = 90% 从-56到-62dB = 80% 从-63到-65dB = 75% The below is not good enough for Apple devicesFrom -66 to 68dB=70% From -69 to 74dB= 60% From -75 to 79dB= 50% From -80 to -83dB=30%
