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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What is NOT a distress signal?（）
What is meant by the term “radio silence”?（）
If your vessel is underway in fog and you hear one prolonged and three short blasts，this indicates a（）.
Distress flares and smoke signals for small passenger vessels（）.
Distress signals may be（）.
The signal to guide vessels in distress，which indicates，“This is the best place to land” is the（）.
When you are firing a pyrotechnic distress signal，it should be aimed at（）.
When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）
What is the fundamental purpose for imposing radio silence? （）
Which is a distress signal? （）