A.20 B.21 C.22 D.23
A.公用ATM網(wǎng)絡(luò) B.專用ATM網(wǎng) C.接入ATM網(wǎng) D.DDN網(wǎng)
A.155.52Mbit/s和622.08Mbit/s B.64kbit/s和384kbit/s C.2.048Mbit/s和34.368Mbit/s D.4.096Mbit/s和68.736Mbit/s