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来自维基教科书，开放的书籍，为开放的世界
<
通信课程
电线
[
编辑
|
编辑源代码
]
通信信号通过电线以辐射电磁波的形式传播到接收器
空气
[
编辑
|
编辑源代码
]
通信信号通过空气以辐射电磁波的形式传播到接收器
类别
:
书籍:通信课程
华夏公益教科书
