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【多选题】
从系统模型的角度来讨论通信系统的分类方法可以有多种分类形式，其中按传输媒介来划分，通信系统可分为（）。
A.
有线通信
B.
无线通信
C.
数字通信
D.
模拟通信
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【简答题】The year of 776 B.C.is considered to be the founding date of the Olympic s in ancient Greece. The s lasted more than 11 centuries_____they were banned in 393 A.D. A．when B．after C．as D．until
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