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A ship fitted with an MF/HF radio installation shall,while it is at sea,maintain a continuous watch on_____.

发布于 2021-04-18 18:37:26

【单选题】
A 8414.5khz
B at least one of the distress and safety DSC frequencies 4207.5kHZ,6312kHz,12577kHz or 16804.5kHZ
C 2187.5kHZ
D 8414.5kHz,2187.5kHZ,and on at least one of the distress and safety DSC frequencies 4207.5kHz,6312kHz,12577kHz or 16804.5kHz

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deng_yulin 2023-04-18

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