题目内容
(请给出正确答案)
[单选题]
二次雷达的询问频率为()MHz,应答频率为()MHz。
A.1030,1030
B.1090,1090
C.1030,1090
D.1090,1030
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A.1030,1030
B.1090,1090
C.1030,1090
D.1090,1030
A. Calling you, Roger?
B. Is the frequency in use?
C. Is any body in the frequency?
D. Any body here?