单项选择题
Which categories of NAVTEX messages may not be selectively rejected through receiver programming?（）
A.Navigational warnings
B.Weather warnings
C.SAR and distress alert information
D.All of the above
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相关考题
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单项选择题
Which action should you take after sending a false distress alert on VHF?（）
A.Send a DSC cancellation message on Ch-70
B.Make a voice announcement to cancel the alert on Ch-16
C.Make a voice announcement to cancel the alert on Ch-13
D.Make a voice announcement to cancel the alert on Ch-22A -
单项选择题
When you are firing a pyrotechnic distress signal，it should be aimed at（）.
A.straight overhead
B.at the vessel whose attention you are trying to get
C.into the wind
D.about 60 degrees above the horizon -
单项选择题
When should distress flares and rockets be used? （）
A.Immediately upon abandoning the vessel
B.Only when there is a chance of their being seen by a rescue vessel
C.At one hour intervals
D.At half hour intervals
