局域网的数据链路层划分为两个子层，即媒体接入控制或媒体访问控制子层和______。
参考答案：逻辑链路控制子层
_____________half an hour earlier, you would have met the famous writer.
A．If you came
B．Would you come
C．Had you come
D．Should you have come
按不同的分类方式，可将ABS分为哪些种类？
