A.兩個子網的接入網元和網關通過交換機相連 B.兩個子網的接入網元通過SEIA網口相連 C.兩個子網的接入網元通過SPWA光口相連 D.兩個子網的接入網元通過SOSC光口相連
A.0dBm B.-3dBm C.-9dBm D.-14dBm
A.-9dBm B.-14dBm C.-18dBm D.-21dBm