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[单选题]

The frequency __is used for NAVTEX-type MSI()

A.4, 125. 0 kHz using simplex mode

B.4, 209. 5 kHz using FEC mode

C.4, 209. 5 kHz using ARQ mode

D.4, 125. 0 kHz using FEC mode

答案
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B、4, 209. 5 kHz using FEC mode

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