How did mobile radio systems find its business competitiveness? We learn from the text that users of wireless products are more

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问题 How did mobile radio systems find its business competitiveness?
We learn from the text that users of wireless products are more often than not confronted with ______.

选项 A、missing networks.
B、technical failures.
C、wrong standards.
D、confusing choices.

答案D

解析
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