問題詳情
29.下列何種頻率專用於狹頻帶直接印字(NBDP)電報的遇險和安全通信?
(A)2171.5 KHz
(B)2172.5 KHz
(C)2173.5 KHz
(D)2174.5 KHz
(A)2171.5 KHz
(B)2172.5 KHz
(C)2173.5 KHz
(D)2174.5 KHz
參考答案
答案:D
難度:簡單0.793651
統計:A(0),B(10),C(3),D(50),E(0)
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