A.consists of 5 or more short blasts of the fog signal apparatus
B.consists of the raising and lowering of a large white flag
C.may be used separately or with other distress signals
D.is used to indicate doubt about another vessel's intentions
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A.Abandon vessel
B.Adrift
C.Beach to
D.Assembly station
A.displaying a large red flag
B.displaying three black balls in a vertical line
C.sounding four or more short rapid blasts on the whistle
D.continuously sounding the fog whistle
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Wat is NOT required in the radiotelephone log?（）
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When you are firing a pyrotechnic distress signal，it should be aimed at（）.
If you are transmitting a distress message by radiotelephone you should（）.
What is the calling and distress frequency on a single side band (SSB) marine radiotelephone?（）
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When sending a DSC call，the vessel’s（）.
Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?（）
How is “radio silence” imposed?（）