A.核心網(wǎng) B.接入網(wǎng) C.用戶駐地網(wǎng) D.傳輸網(wǎng)
A.-8dBm-27dBm B.-8dBm-28dBm C.-3dBm-24dBm D.-3dBm-28dBm
A.10mm B.20mm C.30mm D.40mm