单项选择题
A.Class A EPIRBs
B.Class B EPIRBs
C.L-Band EPIRBs
D.Category I EPIRBs
单项选择题 Which condition represents the appropriate time for setting off distress flares and rockets? （）
单项选择题 Which condition represents the appropriate time for setting off distress flares and rockets? （）
单项选择题 Which categories of NAVTEX messages may not be selectively rejected through receiver programming?（）