单项选择题
A.1颗 B.2颗 C.3颗 D.4颗
A.>-75dBm B.>-80dBm C.>-82dBm D.>-90dBm
A.0V B.220V C.110V D.-48V
A.HCPM B.CMPT C.UPUE D.UTRP
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