Discuss the case where there might be defects in line-of-sight propagation caused by mountainous areas.
会商在视距传布(用户之间直线传布无线电)会发生缺陷的山区中的状况。
Discuss the case where there might be defects in line-of-sight propagation caused by mountainous areas.
在由于山区引起信号传播的阻碍的地区，讨论这样的情形。
The method is especially useful when line-of-sight clearance cannot be obtained above the surface of the earth for the propagation path.
这种方法在传播路上对不能在地表面上获得视线余隙时特别有用。
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