单项选择题
A.A triangular flag above or below a ball B.The International Code Signal of distress indicated by "JV" C.A green smoke signal D.Flames on the vessel as from a burning tar barrel
Which EPIRB transmits a distress alert that is received...
单项选择题Which EPIRB transmits a distress alert that is received and relayed by an INMARSAT satellite?（）
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
