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单选题
Which signal and noise values will result in the best phone communication with an access point？（）
A
Signal strength 0dBm， noise level 6dBm
B
Signal strength 8dBm， noise level 9dBm
C
Signal strength 4 dBm， noise level 4 dBm
D
Signal strength 6dBm， noise level 5 dBm
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考题
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