A.多端口無線上網(wǎng)MODEM B.多端口帶路由功能的無線上網(wǎng)MODEM C.普通ADSLMODEM D.路由器
A.7.4 B.21.5 C.17.2 D.13.9
A.18dBm B.20dBm C.24dBm D.28dBm