单项选择题
A.Class A EPIRBs B.Class B EPIRBs C.L-Band EPIRBs D.Category I EPIRBs
Which condition represents the appropriate time for set...
单项选择题Which condition represents the appropriate time for setting off distress flares and rockets? （）
A.At one hour intervals B.At half hour intervals C.Only when there is a chance of their being seen by rescue vessels D.Immediately upon abandoning the vessel
A.Only when there is a chance of their being seen by rescue vessels B.At half hour intervals C.At one hour intervals D.Immediately upon abandoning the vessel
Which categories of NAVTEX messages may not be selectiv...
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
