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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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