问题
单项选择题
According to covering scope, which three classes can computer network be divided A) PSN, LAN, WANB) MAN, LAN, WAN C) PSN, FAST Ethernet, LAN D) PSN, FAST Ethernet, MAN
A．Receive Ready
B．Receive not Ready
C．Reject
D．Selective Reject
答案
参考答案：A