题目内容
The letter D is the abbreviation for the word distress in _________.
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Which of the following frequencies is as international distress and safety frequencies on MF for radio telephone?
Which of the followings is main factors to influence the propagation range for VHF?
_________ are provided free of charge by the LES.
A DSC call from ship with the called MMSI number 041212345 is _________.
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