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  3. Global satellite communications systems will be useful to ______. What can we say about the new global satellite communications

Global satellite communications systems will be useful to ______. What can we say about the new global satellite communications

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问题 Global satellite communications systems will be useful to ______.
What can we say about the new global satellite communications systems?
选项 A、They are widely used.
B、They are very helpful.
C、They are costly.
D、Both A and B.
答案D
解析
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