题目内容（请给出正确答案）

[主观题]

Compared to civil GPS, what is the serious problem of ADS-B to the drone？

A、It is expensive to access to

B、Its transmissions are not authenticated

C、It is hard to control

D、It is rarely used

提问人：网友luoqiaofu 发布时间：2022-01-07

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