A.隧道技術(shù) B.點(diǎn)對(duì)點(diǎn)通信協(xié)議 C.網(wǎng)絡(luò)電話 D.分組交換
A.4 B.6 C.8 D.10
A.I-mode B.IEEE 802.11b C.Wi-Fi D.Bluetooth