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  3. Global satellite communications systems will be useful to ______. Which of the following is TRUE?

Global satellite communications systems will be useful to ______. Which of the following is TRUE?

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问题 Global satellite communications systems will be useful to ______.
Which of the following is TRUE?
选项 A、The positioning precision of the voice system is better than that of GPS.
B、The positioning precision of the messaging system is better than that of GPS.
C、The positioning precision of the voice system is better than that of the messaging system.
D、The positioning precision of GPS is better than that of the voice system.
答案D
解析
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