单选题What’s the advantage when using the satellites?（）AThe message can be directed to the desired locationBThe message can follow the earth‟s curvatureCThe quality of message can not be affected by climaticDthe range of the message extend and the quality of reception is improved
单选题
What’s the advantage when using the satellites?（）
A
The message can be directed to the desired location
B
The message can follow the earth‟s curvature
C
The quality of message can not be affected by climatic
D
the range of the message extend and the quality of reception is improved
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