题目内容

Satellites have significant ____ over other modes of transmission, such as cable and land-line microwave.

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About ____ of the Earth surface is defined as the line of sight of the satellite.

Each transponder consists of a frequency shifter, a filter and ____.

The communication capacity of a satellite is determined by the ____ of transponder channels and the volume of communication.

The cost of transmission is dependent of geographical terrain or distance.

A. 对
B. 错