题目内容
If a ship, in accordance with the requirements of regulation 7. 1. 2, is fitted with a VHFradio installation, shall, while it is at sea, maintain a continuous watch on__________ .
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If a ship, in accordance with the requirements of regulation 10. 1. 1, is fitted with an Inmarsat ship earth station, shall, while it is at sea, maintain a continuous watch________.
Which frequency in the medium frequency band is used for distress and safety traffic by radiotelephony?
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The address of acknowledgements of DSC alert should be____________.
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