A.聲波發(fā)射邏輯 B.聲波接收邏輯 C.聲波地址 D.握手信號
A.8 B.10 C.16 D.12
A.0.7m;0.5m B.0.7m;0.4m C.0.7m;0.3m D.0.7m;0.2m